No problem, we've got 84553768 and 99681681 to multiply
84553768 × 99681681 = 99681681 × (84553768)
+ 99681681 × 8 which equals 797453448
+ 99681681 × 60 what gives us 5980900860
+ 99681681 × 700 that equals 69777176700
+ 99681681 × 3000 what gives us 299045043000
+ 99681681 × 50000 which equals 4984084050000
+ 99681681 × 500000 giving us 49840840500000
+ 99681681 × 4000000 giving us 398726724000000
+ 99681681 × 80000000 giving us 7974534480000000

= 8428461729124008
