No problem, we've got 81742244 and 20312867 to multiply
81742244 × 20312867 = 20312867 × (81742244)
+ 20312867 × 4 resulting in 81251468
+ 20312867 × 40 giving us 812514680
+ 20312867 × 200 what gives us 4062573400
+ 20312867 × 2000 resulting in 40625734000
+ 20312867 × 40000 resulting in 812514680000
+ 20312867 × 700000 resulting in 14219006900000
+ 20312867 × 1000000 that is equal 20312867000000
+ 20312867 × 80000000 resulting in 1625029360000000

= 1660419330653548
