No problem, we've got 84104406 and 16378920 to multiply
84104406 × 16378920 = 16378920 × (84104406)
+ 16378920 × 6 which equals 98273520
+ 16378920 × 00 giving us 0
+ 16378920 × 400 what gives us 6551568000
+ 16378920 × 4000 resulting in 65515680000
+ 16378920 × 00000 that equals 0
+ 16378920 × 100000 giving us 1637892000000
+ 16378920 × 4000000 giving us 65515680000000
+ 16378920 × 80000000 giving us 1310313600000000

= 1377539337521520
