How do I check if $2^{123456789}$ is divisible by 9?
I tried using modular exponentiation but it is way too tedious.
Is there an easier or faster way to solve it?
Thanks!
2026-04-01 16:19:26.1775060366
Computation of large powers
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Powers of $2$ are not divisible by $9$ as they do not have $3^2$ as factors.