Alright, let's work through 66827200 times 81206853 step by step
66827200 × 81206853 = 81206853 × (66827200)
+ 81206853 × 0 that is equal 0
+ 81206853 × 00 producing 0
+ 81206853 × 200 yielding 16241370600
+ 81206853 × 7000 that equals 568447971000
+ 81206853 × 20000 that equals 1624137060000
+ 81206853 × 800000 producing 64965482400000
+ 81206853 × 6000000 that results in 487241118000000
+ 81206853 × 60000000 giving us 4872411180000000

= 5426826606801600
