What is the factorial of 401? (401!) 401 Factorial

What is the factorial of 401?

Here we will show you how to calculate the factorial of 401 (aka 401 factorial) and give you the approximate scientific notation answer and the exact answer.

Before we begin, note that the factorial of 401 can be written as 401 followed by an exclamation mark like this: 401!

Factorial of 401 means that you multiply 401 by every number below it. Therefore, you calculate the factorial of 401 by multiplying 401 by 400, then by 399, and so on all the way down to 1. In other words, we calculate 401 × 400 × 399 × ... × 1 to get 401 factorial.

The answer to 401 factorial (401!) contains 872 digits and we have listed the exact entire answer at the bottom of this page. However, below is the approximate scientific notation answer to 401 factorial:

2.5677843661 × 10⁸⁷¹

The answer above is also sometimes written as 2.5677843661e+871. Regardless, it means that the approximate answer to 401! is 25677843661 followed by 861 more digits.

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Like we promised, below is the exact answer to 401 factorial (401!) with all 872 digits:

25677843661496182000201536098120705346131735793427186742932462823063761264843919405947669937632769135194034580589378581150167563316290491526813757447368002172874003314486103133011238883275125543974331060893917027155772339882165050114354572724529418209461481285149296399395529834905598835719694439567902779033893749255270049840866482945120105297223119367080161773889051272503394031055339749926338097715765256193148745110636811071194127894147824604213626196670810983752199333135922447325207906649317384097272522026195865012893161521091998770759607457611726029278709849134407169168276138864006470137440254864143541640526605930274559644767095442736918010399294008679446661742025138153178740223002652083011164429306226908181727093035924621223618383677657011688360160118028894208000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

What is the factorial of 402?
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