Question 403466
If you mean double and keep all the pennies, 1+2+4+8 etc, = 2^65 - 1 pennies
If you mean the amount doubled 64 times, that's 2^64 pennies
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2^64 pennies =~ $18,446,744,070,000,000,000.00
2^65 is about 2x that amount.
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Looking again, that's the number of pennies, not dollars.
Divide by 100.