Alright, let's work through 81872142 times 69158104 step by step
81872142 × 69158104 = 69158104 × (81872142)
+ 69158104 × 2 which equals 138316208
+ 69158104 × 40 that is equal 2766324160
+ 69158104 × 100 resulting in 6915810400
+ 69158104 × 2000 that is equal 138316208000
+ 69158104 × 70000 producing 4841067280000
+ 69158104 × 800000 that equals 55326483200000
+ 69158104 × 1000000 resulting in 69158104000000
+ 69158104 × 80000000 what gives us 5532648320000000

= 5662122111138768
