Alright, let's work through 85389909 times 19668727 step by step
85389909 × 19668727 = 19668727 × (85389909)
+ 19668727 × 9 producing 177018543
+ 19668727 × 00 giving us 0
+ 19668727 × 900 that is equal 17701854300
+ 19668727 × 9000 that results in 177018543000
+ 19668727 × 80000 what gives us 1573498160000
+ 19668727 × 300000 giving us 5900618100000
+ 19668727 × 5000000 producing 98343635000000
+ 19668727 × 80000000 yielding 1573498160000000

= 1679510808675843
