Alright, let's work through 80163818 times 43676027 step by step
80163818 × 43676027 = 43676027 × (80163818)
+ 43676027 × 8 giving us 349408216
+ 43676027 × 10 yielding 436760270
+ 43676027 × 800 that results in 34940821600
+ 43676027 × 3000 that equals 131028081000
+ 43676027 × 60000 that equals 2620561620000
+ 43676027 × 100000 that results in 4367602700000
+ 43676027 × 0000000 resulting in 0
+ 43676027 × 80000000 yielding 3494082160000000

= 3501237079391086
