Alright, let's work through 91042103 times 91862759 step by step
91042103 × 91862759 = 91862759 × (91042103)
+ 91862759 × 3 giving us 275588277
+ 91862759 × 00 giving us 0
+ 91862759 × 100 yielding 9186275900
+ 91862759 × 2000 yielding 183725518000
+ 91862759 × 40000 that is equal 3674510360000
+ 91862759 × 000000 which equals 0
+ 91862759 × 1000000 which equals 91862759000000
+ 91862759 × 90000000 producing 8267648310000000

= 8363378766742177
