Closest hex to #ff5566 is #f56

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#f56

ff5566

ff5566

contains f5

0f5 1f5 2f5 3f5 4f5 5f5 6f5 7f5 8f5 9f5 af5 bf5 cf5 df5 ef5 f50 f51 f52 f53 f54 f55 f56 f57 f58 f59 f5a f5b f5c f5d f5e f5f ff5

contains 56

056 156 256 356 456 556 560 561 562 563 564 565 566 567 568 569 56a 56b 56c 56d 56e 56f 656 756 856 956 a56 b56 c56 d56 e56 f56

contains f6

0f6 1f6 2f6 3f6 4f6 5f6 6f6 7f6 8f6 9f6 af6 bf6 cf6 df6 ef6 f60 f61 f62 f63 f64 f65 f66 f67 f68 f69 f6a f6b f6c f6d f6e f6f ff6