Alright, let's work through 82142958 times 81222639 step by step
82142958 × 81222639 = 81222639 × (82142958)
+ 81222639 × 8 that results in 649781112
+ 81222639 × 50 resulting in 4061131950
+ 81222639 × 900 resulting in 73100375100
+ 81222639 × 2000 that is equal 162445278000
+ 81222639 × 40000 giving us 3248905560000
+ 81222639 × 100000 producing 8122263900000
+ 81222639 × 2000000 giving us 162445278000000
+ 81222639 × 80000000 producing 6497811120000000

= 6671867824026162
