Factorial of 18 (18!)
RESULT: 6,402,373,705,728,000
The factorial of 18, written as 18!, is the product of all positive integers less than or equal to 18.
What Is the Formula to Calculate 18 Factorial?
The formula for calculating 18 factorial (18!) is:
18! = 18 × 17 × 16 × 15 × 14 × 13 × 12 × 11 × 10 × 9 × 8 × 7 × 6 × 5 × 4 × 3 × 2 × 1 = 6,402,373,705,728,000
How Many Digits in 18 Factorial?
The number 18! has 16 digits.
Factorial Table From 1! to 18!
| n | n! |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 24 |
| 5 | 120 |
| 6 | 720 |
| 7 | 5,040 |
| 8 | 40,320 |
| 9 | 362,880 |
| 10 | 3,628,800 |
Frequently Asked Questions
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What is 18!?
It's the product of all positive integers from 1 to 18. Answer: 6,402,373,705,728,000.
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Is factorial defined for negative numbers?
No. Factorials are only defined for non-negative integers (0 and up).
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What is 0!?
By definition, the factorial of 0 is 1.