The factorial of 100 is a very large number, which is approximately 9.332621544×10^157. It can be calculated by multiplying 100 by all the positive integers less than it down to 1. The exact value of 100 factorial is 93,326,215,443,944,152,681,699,238,856,266,700,490,715,968,264,381,621,468,592,963,895,217,599,993,229,915,608,941,463,976,156,518,286,253,697,920,827,223,758,251,185,210,916,864,000,000,000,000,000,000,000,000. It has 158 digits in total and 24 trailing zeros. The factorial of a number is the product of all positive integers less than or equal to that number, and it is denoted by the number followed by an exclamation point (n!).