Alright, let's work through 63774581 times 66419761 step by step
63774581 × 66419761 = 66419761 × (63774581)
+ 66419761 × 1 that equals 66419761
+ 66419761 × 80 yielding 5313580880
+ 66419761 × 500 that equals 33209880500
+ 66419761 × 4000 yielding 265679044000
+ 66419761 × 70000 giving us 4649383270000
+ 66419761 × 700000 yielding 46493832700000
+ 66419761 × 3000000 yielding 199259283000000
+ 66419761 × 60000000 producing 3985185660000000

= 4235892427895141
