Alright, let's work through 99984842 times 86016798 step by step
99984842 × 86016798 = 86016798 × (99984842)
+ 86016798 × 2 yielding 172033596
+ 86016798 × 40 what gives us 3440671920
+ 86016798 × 800 yielding 68813438400
+ 86016798 × 4000 yielding 344067192000
+ 86016798 × 80000 producing 6881343840000
+ 86016798 × 900000 producing 77415118200000
+ 86016798 × 9000000 that equals 774151182000000
+ 86016798 × 90000000 what gives us 7741511820000000

= 8600375957375916
