Alright, let's work through 79845531 times 83879445 step by step
79845531 × 83879445 = 83879445 × (79845531)
+ 83879445 × 1 that results in 83879445
+ 83879445 × 30 that is equal 2516383350
+ 83879445 × 500 that is equal 41939722500
+ 83879445 × 5000 what gives us 419397225000
+ 83879445 × 40000 yielding 3355177800000
+ 83879445 × 800000 that equals 67103556000000
+ 83879445 × 9000000 which equals 754915005000000
+ 83879445 × 70000000 which equals 5871561150000000

= 6697398826010295
