Alright, let's work through 80345585 times 61790225 step by step
80345585 × 61790225 = 61790225 × (80345585)
+ 61790225 × 5 that is equal 308951125
+ 61790225 × 80 resulting in 4943218000
+ 61790225 × 500 that is equal 30895112500
+ 61790225 × 5000 giving us 308951125000
+ 61790225 × 40000 that results in 2471609000000
+ 61790225 × 300000 that equals 18537067500000
+ 61790225 × 0000000 that is equal 0
+ 61790225 × 80000000 yielding 4943218000000000

= 4964571774906625
