Alright, let's work through 81613378 times 67493930 step by step
81613378 × 67493930 = 67493930 × (81613378)
+ 67493930 × 8 resulting in 539951440
+ 67493930 × 70 producing 4724575100
+ 67493930 × 300 that equals 20248179000
+ 67493930 × 3000 which equals 202481790000
+ 67493930 × 10000 what gives us 674939300000
+ 67493930 × 600000 that is equal 40496358000000
+ 67493930 × 1000000 what gives us 67493930000000
+ 67493930 × 80000000 which equals 5399514400000000

= 5508407621795540
