Calculate the factorial of 1266 - Factorial Calculator
Quick Answer:
1266! = 6525182715...0000
3,380 digits
| 315 trailing zeros
Factorial Calculator Until 10,000
Nearby Factorials
| n | n! | Digits | Trailing Zeros |
|---|---|---|---|
| 1261! | 20223609...0000 | 3,365 | 314 |
| 1262! | 25522194...0000 | 3,368 | 314 |
| 1263! | 32234532...0000 | 3,371 | 314 |
| 1264! | 40744448...0000 | 3,374 | 314 |
| 1265! | 51541727...0000 | 3,377 | 315 |
| 1266! | 65251827...0000 | 3,380 | 315 |
| 1267! | 82674065...0000 | 3,383 | 315 |
| 1268! | 10483071...0000 | 3,387 | 315 |
| 1269! | 13303017...0000 | 3,390 | 315 |
| 1270! | 16894832...0000 | 3,393 | 316 |
| 1271! | 21473332...0000 | 3,396 | 316 |
Here you can find answers to questions like: Calculate the factorial of 1266 What is the factorial of 1266? What is the last digits of factorial of 1266? How many trailing zeros in 1266 factorial? How many digits are there in 1266 factorial? Use the factorial calculator above to find the factorial of any natural between 0 and 10,000.
What is factorial?
Definition of factorial
The factorial is a quantity defined for any integer n greater than or equal to 0.
The factorial is the product of all integers less than or equal to n but greater than or equal to 1. The factorial value of 0 is, by definition, equal to 1. For negative integers, factorials are not defined. The factorial can be seen as the result of multiplying a sequence of descending natural numbers (such as 3 × 2 × 1).
The factorial symbol is the exclamation mark (!).
The factorial formula
If n is a natural number greater than or equal to 1, then
n! = n x (n - 1) x (n - 2) x (n - 3) ... 3 x 2 x 1
If n = 0, then n! = 1, by convention.
Example: 6! = 6 x 5 x 4 x 3 x 2 x 1 = 720
Shortcut to find trailing zeros in a factorial
Trailing zeros are a sequence of zeros in the decimal representation of a number, after which no other digits follow. This video shows how to find the trailing zeros of a factorial easily.
Table of factorials until 30
| n | n! | |
|---|---|---|
| 1! | 1 | # |
| 2! | 2 | # |
| 3! | 6 | # |
| 4! | 24 | # |
| 5! | 120 | # |
| 6! | 720 | # |
| 7! | 5040 | # |
| 8! | 40320 | # |
| 9! | 362880 | # |
| 10! | 3628800 | # |
| 11! | 39916800 | # |
| 12! | 479001600 | # |
| 13! | 6227020800 | # |
| 14! | 87178291200 | # |
| 15! | 1307674368000 | # |
| 16! | 20922789888000 | # |
| 17! | 355687428096000 | # |
| 18! | 6402373705728000 | # |
| 19! | 121645100408832000 | # |
| 20! | 2432902008176640000 | # |
| 21! | 51090942171709440000 | # |
| 22! | 1124000727777607680000 | # |
| 23! | 25852016738884976640000 | # |
| 24! | 620448401733239439360000 | # |
| 25! | 15511210043330985984000000 | # |
| 26! | 403291461126605635584000000 | # |
| 27! | 10888869450418352160768000000 | # |
| 28! | 304888344611713860501504000000 | # |
| 29! | 8841761993739701954543616000000 | # |
| 30! | 265252859812191058636308480000000 | # |
Frequently Asked Questions
What is 1266 factorial?
1266! = 65251827156213216516.... It has 3,380 digits and 315 trailing zeros.
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Trailing Zeros in Factorials
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Digits in Factorials
Find how many digits are in n! using Stirling's approximation: