Alright, let's work through 53408599 times 40688159 step by step
53408599 × 40688159 = 40688159 × (53408599)
+ 40688159 × 9 that results in 366193431
+ 40688159 × 90 that equals 3661934310
+ 40688159 × 500 yielding 20344079500
+ 40688159 × 8000 that equals 325505272000
+ 40688159 × 00000 resulting in 0
+ 40688159 × 400000 giving us 16275263600000
+ 40688159 × 3000000 that equals 122064477000000
+ 40688159 × 50000000 that equals 2034407950000000

= 2173097568079241
