Alright, let's work through 80879713 times 69642069 step by step
80879713 × 69642069 = 69642069 × (80879713)
+ 69642069 × 3 yielding 208926207
+ 69642069 × 10 which equals 696420690
+ 69642069 × 700 giving us 48749448300
+ 69642069 × 9000 that is equal 626778621000
+ 69642069 × 70000 which equals 4874944830000
+ 69642069 × 800000 that is equal 55713655200000
+ 69642069 × 0000000 giving us 0
+ 69642069 × 80000000 that equals 5571365520000000

= 5632630553446197
