What is the factorial of 640? (640!) 640 Factorial

What is the factorial of 640?

Here we will show you how to calculate the factorial of 640 (aka 640 factorial) and give you the approximate scientific notation answer and the exact answer.

Before we begin, note that the factorial of 640 can be written as 640 followed by an exclamation mark like this: 640!

Factorial of 640 means that you multiply 640 by every number below it. Therefore, you calculate the factorial of 640 by multiplying 640 by 639, then by 638, and so on all the way down to 1. In other words, we calculate 640 × 639 × 638 × ... × 1 to get 640 factorial.

The answer to 640 factorial (640!) contains 1520 digits and we have listed the exact entire answer at the bottom of this page. However, below is the approximate scientific notation answer to 640 factorial:

6.4409718565 × 10¹⁵¹⁹

The answer above is also sometimes written as 6.4409718565e+1519. Regardless, it means that the approximate answer to 640! is 64409718565 followed by 1509 more digits.

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Like we promised, below is the exact answer to 640 factorial (640!) with all 1520 digits:

64409718565200018055131800965981532721782172857809350501197690249179126493865567364359901759424828815083117320871816463020106140978012140712246136492458377710508516955614515870499288921594586346123434331807801705332376438583499830732112050850081772212333495548954853961346428711348679625478228038619242902556432022520662136294311646067063179388639341640855877438120216959063800708753411615928938573254395045513558070216362196754072951643473322511231019894142562784272396885841079611839890149814550124393030219468266150465905824958020882254658486538494965874536709143517528519003174725978536489272424644581896134757504721500575093072296641784946756103722099098549878756050564348909508420874945649507385034268451885894558968007171124318151472664761569931491279455269105452696480012333296289382307693598923787428695573078870389236090124215970404454573387433784503725315189772967190896433139348977260395959589548517793461330628196613401917126378390242846932575232029873412419008507206900285437183141797412171062436383968842790359683220591416841842222511658140716647635269032404235004721905438667198590366480639741664109115150081918513665560555730228075742587325491912535123188628316469961574303233729674610898181081786065982252420557478741130812235511867872174763858096698469910542710610323243679621626208347732531647008976594369084181296766479490152665517956005888000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

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