Alright, let's work through 78888705 times 66699155 step by step
78888705 × 66699155 = 66699155 × (78888705)
+ 66699155 × 5 which equals 333495775
+ 66699155 × 00 that equals 0
+ 66699155 × 700 that equals 46689408500
+ 66699155 × 8000 that results in 533593240000
+ 66699155 × 80000 producing 5335932400000
+ 66699155 × 800000 that results in 53359324000000
+ 66699155 × 8000000 yielding 533593240000000
+ 66699155 × 70000000 what gives us 4668940850000000

= 5261809962544275
