What is the factorial of 1001? (1001!) 1001 Factorial

What is the factorial of 1001?

Here we will show you how to calculate the factorial of 1001 (aka 1001 factorial) and give you the approximate scientific notation answer and the exact answer.

Before we begin, note that the factorial of 1001 can be written as 1001 followed by an exclamation mark like this: 1001!

Factorial of 1001 means that you multiply 1001 by every number below it. Therefore, you calculate the factorial of 1001 by multiplying 1001 by 1000, then by 999, and so on all the way down to 1. In other words, we calculate 1001 × 1000 × 999 × ... × 1 to get 1001 factorial.

The answer to 1001 factorial (1001!) contains 2571 digits and we have listed the exact entire answer at the bottom of this page. However, below is the approximate scientific notation answer to 1001 factorial:

4.0278964733 × 10²⁵⁷⁰

The answer above is also sometimes written as 4.0278964733e+2570. Regardless, it means that the approximate answer to 1001! is 40278964733 followed by 2560 more digits.

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Like we promised, below is the exact answer to 1001 factorial (1001!) with all 2571 digits:

402789647337170867317246136356926989705094239074925347176343710340368450911027649612636252695456374205280468598807393254690298539867803367460225153499614535588421928591160833678742451354915921252299285456946271396995850437959540645019696372741142787347450281325324373824456300226871609431497826989489109522725791691167945698509282421538632966523376679891823696900982075223188279465194065489111498586522997573307838057934994706212934291477882221464914058745808179795130018969175605739824237247684512790169648013778158661520384916357285547219660337504067910087936301580874662367543921288988208261944834178369169805682489420504038334529389177845089679546075023305854006141256288633820079940395329251563788399404652902154519302928365169452383531030755684578503851488154092323576150311569325891190105926118761607100286827930472944913272420825078912158741589850136017030887975452922434889688775883386977825215904423682478943313806072144097432418695807412571292308739802481089407002523955080148184062810447564594783139830113821372260474145316521647368313934670783858482781506915288378941348078689691815657785305896912277993200639858696294199549107738635599538328374931258525869323348477334798827676297868823693023377418942304272267800509765805435653787530370118261219994752588866451072715583785495394684524593296728611334955079882857173250037068541860372512693170819259309411027837176612444692649174536429745421086287708588130082168792750697158901737130221751430550976429258055277255676893874108456870904122902259417224707137723406125811549952159629766771063079472679280213882978523785424760309678138268708239764925768714349554665438389311198715040908077757086900159389712443987670244241787904585093011546861502058550090914877900852701619648229332192401075747543562989953271508977501771085759521631427816116191761031257454497039673414248149210836002497114107565960458576525212556159634975715552638678172137468172843066451093984443636560722213668172225585711566558134467392654185460222589723312097599987253417831473939565071006344352518096564427781204200068323913056897090916602712260306869786107237077572445866572945760977721639408338430009976028970539150822336553856613962747814621747092348996915755983464741082000337526945990059365493439921937093368896754791416759604324895514660325913157843796039917819613717350380997781225472000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

What is the factorial of 1002?
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