No problem, we've got 66760837 and 9956638 to multiply
66760837 × 9956638 = 9956638 × (66760837)
+ 9956638 × 7 yielding 69696466
+ 9956638 × 30 which equals 298699140
+ 9956638 × 800 producing 7965310400
+ 9956638 × 0000 that results in 0
+ 9956638 × 60000 which equals 597398280000
+ 9956638 × 700000 producing 6969646600000
+ 9956638 × 6000000 that equals 59739828000000
+ 9956638 × 60000000 giving us 597398280000000

= 664713486586006
