Sorry but I don't know how to deal big number.
Here's another CODY problem that deals with something similar:
Test if a Number is a Palindrome without using any String Operations
Cody Computer Part 1 - Guess the system font used by uipanel
Determine if input is a perfect number
Breaking Out of the Matrix
Miles to go before I sleep
It's going down. We're finding simbers!
How Far Can You Throw Something?
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