Closest hex to #669911 is #691

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#691

669911

669911

contains 69

069 169 269 369 469 569 669 690 691 692 693 694 695 696 697 698 699 69a 69b 69c 69d 69e 69f 769 869 969 a69 b69 c69 d69 e69 f69

contains 91

091 191 291 391 491 591 691 791 891 910 911 912 913 914 915 916 917 918 919 91a 91b 91c 91d 91e 91f 991 a91 b91 c91 d91 e91 f91

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