Break your calculator 2

What is the last digit of 15971481756990619741985791096205902490738181905 ! 15971481756990619741985791096205902490738181905! ?

Do not use a calculator

1 4 6 3 5 2 0 7

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1 solution

Alex Wang
Oct 17, 2017

The number has 3992870439247654935496447774051475622684545446 zeroes at the end if you use the trailing zeroes formula

And also if you have ANY pair of 5 and 2, which every factorial past 5 has, it ends in a 0

alex wang - 2 years, 9 months ago

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