1. Home ›
2. Factorial ›
3. Factorial of 18

# Factorial of 18 is 6402373705728000 | What is a factorial of 18 ? ## How to calculate the factorial of 18

18! is exactly: 6402373705728000

The number of trailing zeros in 18! is 3.

The number of digits in 18 factorial is 16.

The factorial of 18 is 6402373705728000 calculated, through its definition, this way:

18 X 17 X 16 X 15 X 14 X 13 X 12 X 11 X 10 X 9 X 8 X 7 X 6 X 5 X 4 X 3 X 2 X 1

### What is factorial of 18?

Definition of factorial of 18

The factorial is a basically a quantity which is defined for integer value 18 which is greater than or equal to 0.

The factorial is nothing but the product of all intergers which is less than or equal to n but it is greater than or equal to 1. By definition we can say that the factorial value of 0 is equal to 1. We can not have negative integers factorial as defined. We can see that factorial is the result of multiplying a sequence of descending natural numbers. We can say that factorial of 18 is calculated as 18 X 17 X 16 X 15 X 14 X 13 X 12 X 11 X 10 X 9 X 8 X 7 X 6 X 5 X 4 X 3 X 2 X 1

### Factorial Formula for 18 For 18 is natural number which is greater than or equal to 1. Then we can have the formula as

18! = 18 x (18-1) X (18-2) X (18-3) X (18-4) X (18-5) X (18-6) X (18-7) X (18-8) X (18-9) X (18-10) X (18-11) X (18-12) X (18-13) X (18-14) X (18-15) X (18-16) X (18-17) X (18-18) ..... 18 X 17 X 16 X 15 X 14 X 13 X 12 X 11 X 10 X 9 X 8 X 7 X 6 X 5 X 4 X 3 X 2 X 1

#### Simalar Questions asked in exam for factorial of 18 :-

• Check How many digits are there in 18 factorial?
• What is the factorial of 18?
• How many trailing zeros are in 18 factorial?
• What is the last digits of factorial of 18?

## Table for factorial of 1 to 18

# Factorial of Factorial is
1 1 1
2 2 2
3 3 6
4 4 24
5 5 120
6 6 720
7 7 5040
8 8 40320
9 9 362880
10 10 3628800
11 11 39916800
12 12 479001600
13 13 6227020800
14 14 87178291200
15 15 1307674368000
16 16 20922789888000
17 17 355687428096000
18 18 6402373705728000

### Factorial examples

Example 1:-

What is the factorial of 19?

Solution :-

We know that factorial formula for 19 is
19! = 19 × (19-1) X (19-2) X (19-3) X (19-4) X (19-5) X (19-6) X (19-7) X (19-8) X (19-9) X (19-10) X (19-11) X (19-12) X (19-13) X (19-14) X (19-15) X (19-16) X (19-17) X (19-18) X (19-19) ..... 19 X 18 X 17 X 16 X 15 X 14 X 13 X 12 X 11 X 10 X 9 X 8 X 7 X 6 X 5 X 4 X 3 X 2 X 1

So the factorial of 19 is

19! = 19 X (19-1) X (19-2) X (19-3) X (19-4) X (19-5) X (19-6) X (19-7) X (19-8) X (19-9) X (19-10) X (19-11) X (19-12) X (19-13) X (19-14) X (19-15) X (19-16) X (19-17) X (19-18) X (19-19)

19! = 19 X 18 X 17 X 16 X 15 X 14 X 13 X 12 X 11 X 10 X 9 X 8 X 7 X 6 X 5 X 4 X 3 X 2 X 1

19! = 121645100408832000

Example 2:-

What is the factorial of 20?

Solution :-

We know that factorial formula for 19 is
20! = 20 × (20-1) X (20-2) X (20-3) X (20-4) X (20-5) X (20-6) X (20-7) X (20-8) X (20-9) X (20-10) X (20-11) X (20-12) X (20-13) X (20-14) X (20-15) X (20-16) X (20-17) X (20-18) X (20-19) X (20-20) ..... 20 X 19 X 18 X 17 X 16 X 15 X 14 X 13 X 12 X 11 X 10 X 9 X 8 X 7 X 6 X 5 X 4 X 3 X 2 X 1

So the factorial of 20 is

20! = 20 X (20-1) X (20-2) X (20-3) X (20-4) X (20-5) X (20-6) X (20-7) X (20-8) X (20-9) X (20-10) X (20-11) X (20-12) X (20-13) X (20-14) X (20-15) X (20-16) X (20-17) X (20-18) X (20-19) X (20-20)

20! = 20 X 19 X 18 X 17 X 16 X 15 X 14 X 13 X 12 X 11 X 10 X 9 X 8 X 7 X 6 X 5 X 4 X 3 X 2 X 1

20! = 2432902008176640000

Example 3:-

What is the factorial of 21?

Solution :-

We know that factorial formula for 21 is
21! = 21 × (21-1) X (21-2) X (21-3) X (21-4) X (21-5) X (21-6) X (21-7) X (21-8) X (21-9) X (21-10) X (21-11) X (21-12) X (21-13) X (21-14) X (21-15) X (21-16) X (21-17) X (21-18) X (21-19) X (21-20) X (21-21) ..... 21 X 20 X 19 X 18 X 17 X 16 X 15 X 14 X 13 X 12 X 11 X 10 X 9 X 8 X 7 X 6 X 5 X 4 X 3 X 2 X 1

So the factorial of 21 is

21! = 21 X (21-1) X (21-2) X (21-3) X (21-4) X (21-5) X (21-6) X (21-7) X (21-8) X (21-9) X (21-10) X (21-11) X (21-12) X (21-13) X (21-14) X (21-15) X (21-16) X (21-17) X (21-18) X (21-19) X (21-20) X (21-21)

21! = 21 X 20 X 19 X 18 X 17 X 16 X 15 X 14 X 13 X 12 X 11 X 10 X 9 X 8 X 7 X 6 X 5 X 4 X 3 X 2 X 1

21! = 51090942171709440000

## Frequently Asked Questions(FAQ) for Factorial

##### What is the factorial of 18?
The factorial of 18 is 6402373705728000
##### Check How many digits are there in 18 factorial?

The number of number of digits in 18 factorial is 16.

##### What is the meaning of 18 factorial?
The meaning of 18 factorial is a quantity which is defined for integer value 18 which is greater than or equal to 0.
##### What is the symbol of factorial?

The symbol for factorial is ! (exclamation mark).

##### What is the factorial of 0?

The value of factorial of 0 is 1, i.e. 0! = 1.

##### What is the factorial of 17?

The value of factorial of 17 is 355687428096000.

##### What is the factorial of 21?

The value of factorial of 21 is 51090942171709440000.

##### What is the factorial of 20?

The value of factorial of 20 is 2432902008176640000.