Alright, let's work through 84170824 times 51815696 step by step
84170824 × 51815696 = 51815696 × (84170824)
+ 51815696 × 4 that results in 207262784
+ 51815696 × 20 that results in 1036313920
+ 51815696 × 800 giving us 41452556800
+ 51815696 × 0000 what gives us 0
+ 51815696 × 70000 giving us 3627098720000
+ 51815696 × 100000 giving us 5181569600000
+ 51815696 × 4000000 which equals 207262784000000
+ 51815696 × 80000000 yielding 4145255680000000

= 4361369828453504
