Alright, let's work through 6664 times 6501 step by step
6664 × 6501 = 6501 × (6664)
+ 6501 × 4 resulting in 26004
+ 6501 × 60 that results in 390060
+ 6501 × 600 giving us 3900600
+ 6501 × 6000 producing 39006000

= 43322664
