Closest hex to #66c340 is #6b4

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#6b4

66c340

66c340

contains 6b

06b 16b 26b 36b 46b 56b 66b 6b0 6b1 6b2 6b3 6b4 6b5 6b6 6b7 6b8 6b9 6ba 6bb 6bc 6bd 6be 6bf 76b 86b 96b a6b b6b c6b d6b e6b f6b

contains b4

0b4 1b4 2b4 3b4 4b4 5b4 6b4 7b4 8b4 9b4 ab4 b40 b41 b42 b43 b44 b45 b46 b47 b48 b49 b4a b4b b4c b4d b4e b4f bb4 cb4 db4 eb4 fb4

contains 64

064 164 264 364 464 564 640 641 642 643 644 645 646 647 648 649 64a 64b 64c 64d 64e 64f 664 764 864 964 a64 b64 c64 d64 e64 f64