No problem, we've got 42485491 and 81391571 to multiply
42485491 × 81391571 = 81391571 × (42485491)
+ 81391571 × 1 producing 81391571
+ 81391571 × 90 what gives us 7325241390
+ 81391571 × 400 which equals 32556628400
+ 81391571 × 5000 giving us 406957855000
+ 81391571 × 80000 giving us 6511325680000
+ 81391571 × 400000 yielding 32556628400000
+ 81391571 × 2000000 which equals 162783142000000
+ 81391571 × 40000000 that results in 3255662840000000

= 3457960857196361
