Enter a whole number from 0 to 170 and review its factorial.
The Factorial Calculator computes n!, the product of positive integers up to n. Enter a non-negative whole number within the displayed range of 0 to 170.
For a non-negative integer n, the notation n! means multiplying the integers from 1 through n. By convention, 0! equals 1.
The number of orderings of n distinct items is n!. That makes factorials useful in permutations, combinations, and probability. They grow quickly: 13! exceeds six billion.
55 × 4 × 3 × 2 × 1120There are 120 ways to order five distinct items. A larger reference value is 20 factorial: 2,432,902,008,176,640,000. Compare large results with a trusted exact-integer calculation if every digit matters.
A result displayed in scientific notation, such as 2.43 × 1018, may show only part of an integer's digits. Do not assume arbitrary-size integer support or exact last digits from the page's input range alone.
This calculator is intended for non-negative whole numbers. The factorial of n, written n!, multiplies integers from 1 to n; for example, 5! = 120. The special case 0! equals 1.
Try the Fibonacci Sequence Generator for another number sequence or the Date Calculator for date calculations.
How to Use Factorial Calculator - Calculate n! Online
Type a non-negative integer in Enter Number. The displayed input range is 0 to 170.
Read the result and check whether large values use rounded or scientific notation before relying on every digit.
Select and copy the displayed result if needed. For exact large integers, compare it with a trusted exact-integer calculation.
Enter a whole number from 0 to 170 and review its factorial.
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