As far as idle gains go, I think the save file stores the time of your last activity and what you had then and just calculates what would happen from there, which would explain why the export code doesn't change unless you actually buy something.
9,223,372,036,854,775,807=2^63-1, which is the biggest value that some variables can take. It seems that they just wanted a very large number, but what really bugs me is that after getting the badge my progress is 4660.
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