Sorry but I don't know how to deal big number.
Here's another CODY problem that deals with something similar:
Back to basics 26 - Keywords
Wheat on a chessboard pt 1
I've got the power! (Inspired by Project Euler problem 29)
With apologies to William Blake
Still more miles to go before I sleep
Fun with a compass
High Precision Square Root (Inspired by Project Euler 80)
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