No problem, we've got 81987141 and 66959949 to multiply
81987141 × 66959949 = 66959949 × (81987141)
+ 66959949 × 1 giving us 66959949
+ 66959949 × 40 producing 2678397960
+ 66959949 × 100 yielding 6695994900
+ 66959949 × 7000 resulting in 468719643000
+ 66959949 × 80000 what gives us 5356795920000
+ 66959949 × 900000 what gives us 60263954100000
+ 66959949 × 1000000 resulting in 66959949000000
+ 66959949 × 80000000 what gives us 5356795920000000

= 5489854780015809
