Closest hex to #66d178 is #6c7

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#6c7

66d178

66d178

contains 6c

06c 16c 26c 36c 46c 56c 66c 6c0 6c1 6c2 6c3 6c4 6c5 6c6 6c7 6c8 6c9 6ca 6cb 6cc 6cd 6ce 6cf 76c 86c 96c a6c b6c c6c d6c e6c f6c

contains c7

0c7 1c7 2c7 3c7 4c7 5c7 6c7 7c7 8c7 9c7 ac7 bc7 c70 c71 c72 c73 c74 c75 c76 c77 c78 c79 c7a c7b c7c c7d c7e c7f cc7 dc7 ec7 fc7

contains 67

067 167 267 367 467 567 667 670 671 672 673 674 675 676 677 678 679 67a 67b 67c 67d 67e 67f 767 867 967 a67 b67 c67 d67 e67 f67