Alright, let's work through 16716394 times 81819640 step by step
16716394 × 81819640 = 81819640 × (16716394)
+ 81819640 × 4 giving us 327278560
+ 81819640 × 90 yielding 7363767600
+ 81819640 × 300 which equals 24545892000
+ 81819640 × 6000 resulting in 490917840000
+ 81819640 × 10000 what gives us 818196400000
+ 81819640 × 700000 producing 57273748000000
+ 81819640 × 6000000 that results in 490917840000000
+ 81819640 × 10000000 that equals 818196400000000

= 1367729339178160
