Closest hex to #66bb00 is #6b0

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#
#6b0

66bb00

66bb00

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 b0

0b0 1b0 2b0 3b0 4b0 5b0 6b0 7b0 8b0 9b0 ab0 b00 b01 b02 b03 b04 b05 b06 b07 b08 b09 b0a b0b b0c b0d b0e b0f bb0 cb0 db0 eb0 fb0

contains 60

060 160 260 360 460 560 600 601 602 603 604 605 606 607 608 609 60a 60b 60c 60d 60e 60f 660 760 860 960 a60 b60 c60 d60 e60 f60