15! (the factorial of 15) is 1,307,674,368,000.
15! (the factorial of 15) is 1,307,674,368,000.
The factorial of a whole number n is the product of every whole number from n down to 1.
15! = 15 × 14 × 13 × 12 × 11 × 10 × 9 × 8 × 7 × 6 × 5 × 4 × 3 × 2 × 1 = 1,307,674,368,000
15! has 13 digits. Factorials grow very quickly: each step multiplies by a bigger number than the last, so 15! is 15 times larger than 14! (87,178,291,200).
Many calculators show the result in scientific notation for large factorials.
| 15! | = 1,307,674,368,000 |
| 14! | = 87,178,291,200 |
| 15! ÷ 14! | = 15 |
| 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 |
15! (the factorial of 15) is 1,307,674,368,000.
Multiply all whole numbers from 15 down to 1: 15 × 14 × 13 × 12 × 11 × 10 × 9 × 8 × 7 × 6 × 5 × 4 × 3 × 2 × 1 = 1,307,674,368,000.
15! has 13 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.