Alright, let's work through 61640504 times 8200103 step by step
61640504 × 8200103 = 8200103 × (61640504)
+ 8200103 × 4 which equals 32800412
+ 8200103 × 00 yielding 0
+ 8200103 × 500 that is equal 4100051500
+ 8200103 × 0000 resulting in 0
+ 8200103 × 40000 that equals 328004120000
+ 8200103 × 600000 yielding 4920061800000
+ 8200103 × 1000000 resulting in 8200103000000
+ 8200103 × 60000000 resulting in 492006180000000

= 505458481771912
