No problem, we've got 81232919 and 80105123 to multiply
81232919 × 80105123 = 80105123 × (81232919)
+ 80105123 × 9 what gives us 720946107
+ 80105123 × 10 that equals 801051230
+ 80105123 × 900 producing 72094610700
+ 80105123 × 2000 that results in 160210246000
+ 80105123 × 30000 that is equal 2403153690000
+ 80105123 × 200000 giving us 16021024600000
+ 80105123 × 1000000 giving us 80105123000000
+ 80105123 × 80000000 what gives us 6408409840000000

= 6507172968144037
