Alright, let's work through 82161989 times 20886165 step by step
82161989 × 20886165 = 20886165 × (82161989)
+ 20886165 × 9 resulting in 187975485
+ 20886165 × 80 what gives us 1670893200
+ 20886165 × 900 that results in 18797548500
+ 20886165 × 1000 resulting in 20886165000
+ 20886165 × 60000 producing 1253169900000
+ 20886165 × 100000 yielding 2088616500000
+ 20886165 × 2000000 that is equal 41772330000000
+ 20886165 × 80000000 producing 1670893200000000

= 1716048858982185
