Alright, let's work through 40803531 times 99505981 step by step
40803531 × 99505981 = 99505981 × (40803531)
+ 99505981 × 1 what gives us 99505981
+ 99505981 × 30 resulting in 2985179430
+ 99505981 × 500 which equals 49752990500
+ 99505981 × 3000 that equals 298517943000
+ 99505981 × 00000 producing 0
+ 99505981 × 800000 that results in 79604784800000
+ 99505981 × 0000000 yielding 0
+ 99505981 × 40000000 yielding 3980239240000000

= 4060195380418911
