Closest hex to #645cb5 is #65b

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#65b

645cb5

645cb5

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 5b

05b 15b 25b 35b 45b 55b 5b0 5b1 5b2 5b3 5b4 5b5 5b6 5b7 5b8 5b9 5ba 5bb 5bc 5bd 5be 5bf 65b 75b 85b 95b a5b b5b c5b d5b e5b f5b

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