Closest hex to #664064 is #646

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#
#646

664064

664064

contains 64

064 164 264 364 464 564 640 641 642 643 644 645 646 647 648 649 64a 64b 64c 64d 64e 64f 664 764 864 964 a64 b64 c64 d64 e64 f64

contains 46

046 146 246 346 446 460 461 462 463 464 465 466 467 468 469 46a 46b 46c 46d 46e 46f 546 646 746 846 946 a46 b46 c46 d46 e46 f46

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