Alright, let's work through 81006666 times 67843656 step by step
81006666 × 67843656 = 67843656 × (81006666)
+ 67843656 × 6 producing 407061936
+ 67843656 × 60 which equals 4070619360
+ 67843656 × 600 which equals 40706193600
+ 67843656 × 6000 resulting in 407061936000
+ 67843656 × 00000 that is equal 0
+ 67843656 × 000000 what gives us 0
+ 67843656 × 1000000 producing 67843656000000
+ 67843656 × 80000000 which equals 5427492480000000

= 5495788381810896
