Alright, let's work through 80174818 times 64313121 step by step
80174818 × 64313121 = 64313121 × (80174818)
+ 64313121 × 8 that equals 514504968
+ 64313121 × 10 resulting in 643131210
+ 64313121 × 800 yielding 51450496800
+ 64313121 × 4000 which equals 257252484000
+ 64313121 × 70000 giving us 4501918470000
+ 64313121 × 100000 that results in 6431312100000
+ 64313121 × 0000000 that results in 0
+ 64313121 × 80000000 that results in 5145049680000000

= 5156292771186978
