Alright, let's work through 84867579 times 75153603 step by step
84867579 × 75153603 = 75153603 × (84867579)
+ 75153603 × 9 giving us 676382427
+ 75153603 × 70 that is equal 5260752210
+ 75153603 × 500 what gives us 37576801500
+ 75153603 × 7000 that equals 526075221000
+ 75153603 × 60000 that is equal 4509216180000
+ 75153603 × 800000 what gives us 60122882400000
+ 75153603 × 4000000 giving us 300614412000000
+ 75153603 × 80000000 which equals 6012288240000000

= 6378104339737137
