Closest hex to #66bb11 is #6b1

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#
#6b1

66bb11

66bb11

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 b1

0b1 1b1 2b1 3b1 4b1 5b1 6b1 7b1 8b1 9b1 ab1 b10 b11 b12 b13 b14 b15 b16 b17 b18 b19 b1a b1b b1c b1d b1e b1f bb1 cb1 db1 eb1 fb1

contains 61

061 161 261 361 461 561 610 611 612 613 614 615 616 617 618 619 61a 61b 61c 61d 61e 61f 661 761 861 961 a61 b61 c61 d61 e61 f61