Alright, let's work through 81941831 times 51779739 step by step
81941831 × 51779739 = 51779739 × (81941831)
+ 51779739 × 1 which equals 51779739
+ 51779739 × 30 producing 1553392170
+ 51779739 × 800 that is equal 41423791200
+ 51779739 × 1000 that equals 51779739000
+ 51779739 × 40000 yielding 2071189560000
+ 51779739 × 900000 which equals 46601765100000
+ 51779739 × 1000000 which equals 51779739000000
+ 51779739 × 80000000 producing 4142379120000000

= 4242926622362109
