Alright, let's work through 66307513 times 71936534 step by step
66307513 × 71936534 = 71936534 × (66307513)
+ 71936534 × 3 that results in 215809602
+ 71936534 × 10 what gives us 719365340
+ 71936534 × 500 that results in 35968267000
+ 71936534 × 7000 resulting in 503555738000
+ 71936534 × 00000 what gives us 0
+ 71936534 × 300000 that results in 21580960200000
+ 71936534 × 6000000 giving us 431619204000000
+ 71936534 × 60000000 that equals 4316192040000000

= 4769932663379942
