Sorry but I don't know how to deal big number.
Here's another CODY problem that deals with something similar:
Extract leading non-zero digit
Project Euler: Problem 16, Sums of Digits of Powers of Two
Back to basics 5 - Clipboard
Moving average (variable kernel length)
How many days?!?
Sums of Distinct Powers
Muphry's Law of MATLAB
Pandigital Factors (Based on Euler 491)
Give me Hamming on five, hold the mayo
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