Alright, let's work through 83905742 times 54170951 step by step
83905742 × 54170951 = 54170951 × (83905742)
+ 54170951 × 2 that is equal 108341902
+ 54170951 × 40 that is equal 2166838040
+ 54170951 × 700 yielding 37919665700
+ 54170951 × 5000 that results in 270854755000
+ 54170951 × 00000 giving us 0
+ 54170951 × 900000 which equals 48753855900000
+ 54170951 × 3000000 yielding 162512853000000
+ 54170951 × 80000000 yielding 4333676080000000

= 4545253838500642
