Closest hex to #615c6c is #656

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#
#656

615c6c

615c6c

contains 65

065 165 265 365 465 565 650 651 652 653 654 655 656 657 658 659 65a 65b 65c 65d 65e 65f 665 765 865 965 a65 b65 c65 d65 e65 f65

contains 56

056 156 256 356 456 556 560 561 562 563 564 565 566 567 568 569 56a 56b 56c 56d 56e 56f 656 756 856 956 a56 b56 c56 d56 e56 f56

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