Alright, let's work through 80299574 times 83720311 step by step
80299574 × 83720311 = 83720311 × (80299574)
+ 83720311 × 4 resulting in 334881244
+ 83720311 × 70 producing 5860421770
+ 83720311 × 500 that equals 41860155500
+ 83720311 × 9000 producing 753482799000
+ 83720311 × 90000 what gives us 7534827990000
+ 83720311 × 200000 that is equal 16744062200000
+ 83720311 × 0000000 that equals 0
+ 83720311 × 80000000 that equals 6697624880000000

= 6722705308447514
