No problem, we've got 80436638 and 66122493 to multiply
80436638 × 66122493 = 66122493 × (80436638)
+ 66122493 × 8 that equals 528979944
+ 66122493 × 30 giving us 1983674790
+ 66122493 × 600 which equals 39673495800
+ 66122493 × 6000 which equals 396734958000
+ 66122493 × 30000 which equals 1983674790000
+ 66122493 × 400000 that is equal 26448997200000
+ 66122493 × 0000000 resulting in 0
+ 66122493 × 80000000 which equals 5289799440000000

= 5318671033098534
