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45! Factorial of 45

Value of 45! i.e, Factorial of 45 =
11962222086548019456
19631614956577150643
83733760000000000



In general, the factorial of a number N = N*(N-1)*(N-2)....1
Factorial of a non-negative integer n is the product of all positive integers less than or equal to n. Factorials are commonly encountered in permutations, combinations, number theory and series expansions of trigonometric and other functions (Taylor series).

Number of trailing zeros in 45! = 10
To understand factorials, you might find it useful to read the Factorial tutorial over here.
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