Closest hex to #668668 is #686

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#686

668668

668668

contains 68

068 168 268 368 468 568 668 680 681 682 683 684 685 686 687 688 689 68a 68b 68c 68d 68e 68f 768 868 968 a68 b68 c68 d68 e68 f68

contains 86

086 186 286 386 486 586 686 786 860 861 862 863 864 865 866 867 868 869 86a 86b 86c 86d 86e 86f 886 986 a86 b86 c86 d86 e86 f86

contains 66

066 166 266 366 466 566 660 661 662 663 664 665 666 667 668 669 66a 66b 66c 66d 66e 66f 766 866 966 a66 b66 c66 d66 e66 f66