Alright, let's work through 83103320 times 53780897 step by step
83103320 × 53780897 = 53780897 × (83103320)
+ 53780897 × 0 which equals 0
+ 53780897 × 20 producing 1075617940
+ 53780897 × 300 producing 16134269100
+ 53780897 × 3000 what gives us 161342691000
+ 53780897 × 00000 yielding 0
+ 53780897 × 100000 that results in 5378089700000
+ 53780897 × 3000000 yielding 161342691000000
+ 53780897 × 80000000 what gives us 4302471760000000

= 4469371093278040
