Alright, let's work through 77321189 times 52161491 step by step
77321189 × 52161491 = 52161491 × (77321189)
+ 52161491 × 9 giving us 469453419
+ 52161491 × 80 giving us 4172919280
+ 52161491 × 100 giving us 5216149100
+ 52161491 × 1000 which equals 52161491000
+ 52161491 × 20000 yielding 1043229820000
+ 52161491 × 300000 yielding 15648447300000
+ 52161491 × 7000000 resulting in 365130437000000
+ 52161491 × 70000000 that results in 3651304370000000

= 4033188504132799
