Alright, let's work through 84986537 times 63997668 step by step
84986537 × 63997668 = 63997668 × (84986537)
+ 63997668 × 7 that equals 447983676
+ 63997668 × 30 giving us 1919930040
+ 63997668 × 500 resulting in 31998834000
+ 63997668 × 6000 producing 383986008000
+ 63997668 × 80000 which equals 5119813440000
+ 63997668 × 900000 what gives us 57597901200000
+ 63997668 × 4000000 that results in 255990672000000
+ 63997668 × 80000000 that results in 5119813440000000

= 5438940179395716
