Alright, let's work through 77707573 times 71054033 step by step
77707573 × 71054033 = 71054033 × (77707573)
+ 71054033 × 3 that results in 213162099
+ 71054033 × 70 what gives us 4973782310
+ 71054033 × 500 that results in 35527016500
+ 71054033 × 7000 yielding 497378231000
+ 71054033 × 00000 that results in 0
+ 71054033 × 700000 yielding 49737823100000
+ 71054033 × 7000000 producing 497378231000000
+ 71054033 × 70000000 that equals 4973782310000000

= 5521436456291909
