Alright, let's work through 80673873 times 77818687 step by step
80673873 × 77818687 = 77818687 × (80673873)
+ 77818687 × 3 giving us 233456061
+ 77818687 × 70 which equals 5447308090
+ 77818687 × 800 that is equal 62254949600
+ 77818687 × 3000 producing 233456061000
+ 77818687 × 70000 resulting in 5447308090000
+ 77818687 × 600000 giving us 46691212200000
+ 77818687 × 0000000 yielding 0
+ 77818687 × 80000000 producing 6225494960000000

= 6277934872064751
