solana-atomic-u64 is used at run time in 151 crates (of which 1 optionally). It is a direct run-time dependency in 3 crates. It's used only as a dev dependency in 3 crates.

Depender (with downloads and own rev deps) solana-atomic-u64 version
1.1M 546 solana-program =2.1.0
6.3K 31 solana-pubkey =2.1.0
6.3K 6 solana-hash =2.1.0