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What is 15!?

This is a direct factorial evaluation question, so you multiply each whole number from 15 down to 1.

Exact result

1,307,674,368,000

15! is 1,307,674,368,000.

15! means 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, which evaluates to 1,307,674,368,000.

Worked steps

Show your work

  1. Input: n = 15
  2. Formula: n!
  3. Substitute: 15!
  4. Steps: multiply every whole number from 1 through 15
  5. Result: 15! is 1,307,674,368,000.

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Verify the same values in the calculator

15! means 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, which evaluates to 1,307,674,368,000.

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