Alright, let's work through 81490102 times 69511491 step by step
81490102 × 69511491 = 69511491 × (81490102)
+ 69511491 × 2 giving us 139022982
+ 69511491 × 00 giving us 0
+ 69511491 × 100 that equals 6951149100
+ 69511491 × 0000 that equals 0
+ 69511491 × 90000 what gives us 6256034190000
+ 69511491 × 400000 which equals 27804596400000
+ 69511491 × 1000000 that equals 69511491000000
+ 69511491 × 80000000 producing 5560919280000000

= 5664498491762082
