Alright, let's work through 64163484 times 54890061 step by step
64163484 × 54890061 = 54890061 × (64163484)
+ 54890061 × 4 that results in 219560244
+ 54890061 × 80 that equals 4391204880
+ 54890061 × 400 that equals 21956024400
+ 54890061 × 3000 that is equal 164670183000
+ 54890061 × 60000 yielding 3293403660000
+ 54890061 × 100000 that results in 5489006100000
+ 54890061 × 4000000 producing 219560244000000
+ 54890061 × 60000000 that equals 3293403660000000

= 3521937550732524
