Closest hex to #55ffff is #5ff

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#5ff

55ffff

55ffff

contains 5f

05f 15f 25f 35f 45f 55f 5f0 5f1 5f2 5f3 5f4 5f5 5f6 5f7 5f8 5f9 5fa 5fb 5fc 5fd 5fe 5ff 65f 75f 85f 95f a5f b5f c5f d5f e5f f5f

contains ff

0ff 1ff 2ff 3ff 4ff 5ff 6ff 7ff 8ff 9ff aff bff cff dff eff ff0 ff1 ff2 ff3 ff4 ff5 ff6 ff7 ff8 ff9 ffa ffb ffc ffd ffe fff

contains 5f

05f 15f 25f 35f 45f 55f 5f0 5f1 5f2 5f3 5f4 5f5 5f6 5f7 5f8 5f9 5fa 5fb 5fc 5fd 5fe 5ff 65f 75f 85f 95f a5f b5f c5f d5f e5f f5f