Sorry but I don't know how to deal big number.
Here's another CODY problem that deals with something similar:
Return a list sorted by number of occurrences
Word Counting and Indexing
Project Euler: Problem 6, Natural numbers, squares and sums.
Combinations without using nchoosek
Number of Horns on a unicorn!
Hackathon - String version
Golomb's self-describing sequence (based on Euler 341)
It's going down. We're finding simbers!
Singularity v5 (with apologies to the true hack masters)
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