Alright, let's work through 77502751 times 66821073 step by step
77502751 × 66821073 = 66821073 × (77502751)
+ 66821073 × 1 that results in 66821073
+ 66821073 × 50 resulting in 3341053650
+ 66821073 × 700 what gives us 46774751100
+ 66821073 × 2000 that is equal 133642146000
+ 66821073 × 00000 that equals 0
+ 66821073 × 500000 which equals 33410536500000
+ 66821073 × 7000000 resulting in 467747511000000
+ 66821073 × 70000000 resulting in 4677475110000000

= 5178816982271823
