Alright, let's work through 81978159 times 98346501 step by step
81978159 × 98346501 = 98346501 × (81978159)
+ 98346501 × 9 what gives us 885118509
+ 98346501 × 50 yielding 4917325050
+ 98346501 × 100 producing 9834650100
+ 98346501 × 8000 that equals 786772008000
+ 98346501 × 70000 that results in 6884255070000
+ 98346501 × 900000 what gives us 88511850900000
+ 98346501 × 1000000 producing 98346501000000
+ 98346501 × 80000000 which equals 7867720080000000

= 8062265096071659
