Alright, let's work through 66945120 times 63812943 step by step
66945120 × 63812943 = 63812943 × (66945120)
+ 63812943 × 0 that results in 0
+ 63812943 × 20 that results in 1276258860
+ 63812943 × 100 giving us 6381294300
+ 63812943 × 5000 that results in 319064715000
+ 63812943 × 40000 giving us 2552517720000
+ 63812943 × 900000 what gives us 57431648700000
+ 63812943 × 6000000 what gives us 382877658000000
+ 63812943 × 60000000 giving us 3828776580000000

= 4271965126688160
