Alright, let's work through 80208829 times 19690153 step by step
80208829 × 19690153 = 19690153 × (80208829)
+ 19690153 × 9 giving us 177211377
+ 19690153 × 20 that equals 393803060
+ 19690153 × 800 that is equal 15752122400
+ 19690153 × 8000 that equals 157521224000
+ 19690153 × 00000 yielding 0
+ 19690153 × 200000 that is equal 3938030600000
+ 19690153 × 0000000 what gives us 0
+ 19690153 × 80000000 giving us 1575212240000000

= 1579324114960837
