Alright, let's work through 83397968 times 77495821 step by step
83397968 × 77495821 = 77495821 × (83397968)
+ 77495821 × 8 yielding 619966568
+ 77495821 × 60 which equals 4649749260
+ 77495821 × 900 which equals 69746238900
+ 77495821 × 7000 giving us 542470747000
+ 77495821 × 90000 producing 6974623890000
+ 77495821 × 300000 that equals 23248746300000
+ 77495821 × 3000000 that equals 232487463000000
+ 77495821 × 80000000 which equals 6199665680000000

= 6462993999891728
