Alright, let's work through 51389841 times 83091854 step by step
51389841 × 83091854 = 83091854 × (51389841)
+ 83091854 × 1 giving us 83091854
+ 83091854 × 40 that results in 3323674160
+ 83091854 × 800 yielding 66473483200
+ 83091854 × 9000 what gives us 747826686000
+ 83091854 × 80000 giving us 6647348320000
+ 83091854 × 300000 producing 24927556200000
+ 83091854 × 1000000 giving us 83091854000000
+ 83091854 × 50000000 which equals 4154592700000000

= 4270077165455214
