18! (the factorial of 18) is 6,402,373,705,728,000.
18! (the factorial of 18) is 6,402,373,705,728,000.
The factorial of a whole number n is the product of every whole number from n down to 1.
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
18! has 16 digits. Factorials grow very quickly: each step multiplies by a bigger number than the last, so 18! is 18 times larger than 17! (355,687,428,096,000).
Many calculators show the result in scientific notation for large factorials.
| 18! | = 6,402,373,705,728,000 |
| 17! | = 355,687,428,096,000 |
| 18! ÷ 17! | = 18 |
| n | n! | Digits |
|---|---|---|
| 1! | 1 | 1 digits |
| 2! | 2 | 1 digits |
| 3! | 6 | 1 digits |
| 4! | 24 | 2 digits |
| 5! | 120 | 3 digits |
| 6! | 720 | 3 digits |
| 7! | 5,040 | 4 digits |
| 8! | 40,320 | 5 digits |
| 9! | 362,880 | 6 digits |
| 10! | 3,628,800 | 7 digits |
| 11! | 39,916,800 | 8 digits |
| 12! | 479,001,600 | 9 digits |
| 13! | 6,227,020,800 | 10 digits |
| 14! | 87,178,291,200 | 11 digits |
| 15! | 1,307,674,368,000 | 13 digits |
| 16! | 20,922,789,888,000 | 14 digits |
| 17! | 355,687,428,096,000 | 15 digits |
| 18! | 6,402,373,705,728,000 | 16 digits |
| 19! | 121,645,100,408,832,000 | 18 digits |
| 20! | 2,432,902,008,176,640,000 | 19 digits |
18! (the factorial of 18) is 6,402,373,705,728,000.
Multiply all whole numbers from 18 down to 1: 18 × 17 × 16 × 15 × 14 × 13 × 12 × 11 × 10 × 9 × 8 × 7 × 6 × 5 × 4 × 3 × 2 × 1 = 6,402,373,705,728,000.
18! has 16 digits.
0! is defined as 1, which keeps formulas for permutations and combinations consistent.
Yes. Use the calculator on this page, or open the full free Scientific Calculator with memory, history and keyboard support.