Alright, let's work through 8121620 times 68851604 step by step
8121620 × 68851604 = 68851604 × (8121620)
+ 68851604 × 0 what gives us 0
+ 68851604 × 20 yielding 1377032080
+ 68851604 × 600 that is equal 41310962400
+ 68851604 × 1000 what gives us 68851604000
+ 68851604 × 20000 that equals 1377032080000
+ 68851604 × 100000 which equals 6885160400000
+ 68851604 × 8000000 that equals 550812832000000

= 559186564078480
