What is the factorial of 991? (991!) 991 Factorial

What is the factorial of 991?

Here we will show you how to calculate the factorial of 991 (aka 991 factorial) and give you the approximate scientific notation answer and the exact answer.

Before we begin, note that the factorial of 991 can be written as 991 followed by an exclamation mark like this: 991!

Factorial of 991 means that you multiply 991 by every number below it. Therefore, you calculate the factorial of 991 by multiplying 991 by 990, then by 989, and so on all the way down to 1. In other words, we calculate 991 × 990 × 989 × ... × 1 to get 991 factorial.

The answer to 991 factorial (991!) contains 2541 digits and we have listed the exact entire answer at the bottom of this page. However, below is the approximate scientific notation answer to 991 factorial:

4.1717983700 × 10²⁵⁴⁰

The answer above is also sometimes written as 4.1717983700e+2540. Regardless, it means that the approximate answer to 991! is 41717983700 followed by 2530 more digits.

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Like we promised, below is the exact answer to 991 factorial (991!) with all 2541 digits:

417179837008898051305137572955037217180075533593600190448367751711658522803042920407659667681671550313449147762120817626198861931595935569889203965569931935833082499213793375696767959317245564893346409454933324178529318983145082292760079518293345899478479982520895289041508276123523345957940104031937424170282372484514668131895487672432047739536490556056095480952849683209589845107446428205864271438819093467192157234744157392483512795392534380378498159627257871172088904752877996365923188483538260564320590202317893979839954197822082793789948185738551334527430959796523189333171036438646101234946817123912427342940058390652047352722747884854436815055134376536404414592612240685731993389812506321013513785740757054253413706124336292392049098506187083476948847370072302988053199131774520557439190137820091075789844889557717070172435577478227156769630305784189412895191607360050288321339316588213774896487843583324350688749836621132477702183824352006834956331057990495500603911197310007894071894692308162003831793252972881680045885026708814737275998914561646477689983874839281149338266142641465941717831061796057116179909172150700175870327190357639503067470275485631132453863112960342067257577951371502389578092886085028185034767724409715041867293765225321044754958576237840021615123443923248439824946562372440164149852856491682600834997064177223870329527710831274890656132051282699808001057916199246435709302935996181592184936242719471560670591504531489335908014763799215015598450198348583821417967428916900893496496442770551025547911981978408804410960114183367793506069861091606000023562051030372601229550116894820409775292609562586041402953435333716144769683357628774002542639926265601814128261186924112309801935006043219062073929647853815306634349930891861507518338596421194761307964750625156243862806224247823982709620633975381895920390114714164911238363736681627262379324735766466774539571412046358735217579913402712917345953647000848035080633995093904750120030609038925463781707296520964786606386968850115376448617127275716944312272661061615345761181307484514663221588652309008851270583471395829692372949972309191790282079208717108563805823591364540520297190348741185151049245570202737994550129382988816629900854900376657002478681288882221883921016389527035218915933491410226214999927921049600000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

What is the factorial of 992?
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