Alright, let's work through 84154425 times 63684314 step by step
84154425 × 63684314 = 63684314 × (84154425)
+ 63684314 × 5 producing 318421570
+ 63684314 × 20 that equals 1273686280
+ 63684314 × 400 resulting in 25473725600
+ 63684314 × 4000 yielding 254737256000
+ 63684314 × 50000 which equals 3184215700000
+ 63684314 × 100000 resulting in 6368431400000
+ 63684314 × 4000000 giving us 254737256000000
+ 63684314 × 80000000 that results in 5094745120000000

= 5359316826189450
