Alright, let's work through 77856900 times 65880745 step by step
77856900 × 65880745 = 65880745 × (77856900)
+ 65880745 × 0 that results in 0
+ 65880745 × 00 what gives us 0
+ 65880745 × 900 giving us 59292670500
+ 65880745 × 6000 resulting in 395284470000
+ 65880745 × 50000 giving us 3294037250000
+ 65880745 × 800000 that is equal 52704596000000
+ 65880745 × 7000000 giving us 461165215000000
+ 65880745 × 70000000 that is equal 4611652150000000

= 5129270575390500
