Closest hex to #66ffaa is #6fa

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#6fa

66ffaa

66ffaa

contains 6f

06f 16f 26f 36f 46f 56f 66f 6f0 6f1 6f2 6f3 6f4 6f5 6f6 6f7 6f8 6f9 6fa 6fb 6fc 6fd 6fe 6ff 76f 86f 96f a6f b6f c6f d6f e6f f6f

contains fa

0fa 1fa 2fa 3fa 4fa 5fa 6fa 7fa 8fa 9fa afa bfa cfa dfa efa fa0 fa1 fa2 fa3 fa4 fa5 fa6 fa7 fa8 fa9 faa fab fac fad fae faf ffa

contains 6a

06a 16a 26a 36a 46a 56a 66a 6a0 6a1 6a2 6a3 6a4 6a5 6a6 6a7 6a8 6a9 6aa 6ab 6ac 6ad 6ae 6af 76a 86a 96a a6a b6a c6a d6a e6a f6a