Alright, let's work through 80253819 times 83009122 step by step
80253819 × 83009122 = 83009122 × (80253819)
+ 83009122 × 9 that is equal 747082098
+ 83009122 × 10 resulting in 830091220
+ 83009122 × 800 giving us 66407297600
+ 83009122 × 3000 what gives us 249027366000
+ 83009122 × 50000 yielding 4150456100000
+ 83009122 × 200000 that is equal 16601824400000
+ 83009122 × 0000000 which equals 0
+ 83009122 × 80000000 which equals 6640729760000000

= 6661799052336918
