Alright, let's work through 80820601 times 83908507 step by step
80820601 × 83908507 = 83908507 × (80820601)
+ 83908507 × 1 what gives us 83908507
+ 83908507 × 00 what gives us 0
+ 83908507 × 600 giving us 50345104200
+ 83908507 × 0000 which equals 0
+ 83908507 × 20000 producing 1678170140000
+ 83908507 × 800000 giving us 67126805600000
+ 83908507 × 0000000 producing 0
+ 83908507 × 80000000 which equals 6712680560000000

= 6781535964752707
