Alright, let's work through 85129527 times 64153894 step by step
85129527 × 64153894 = 64153894 × (85129527)
+ 64153894 × 7 that results in 449077258
+ 64153894 × 20 resulting in 1283077880
+ 64153894 × 500 that results in 32076947000
+ 64153894 × 9000 that is equal 577385046000
+ 64153894 × 20000 yielding 1283077880000
+ 64153894 × 100000 giving us 6415389400000
+ 64153894 × 5000000 which equals 320769470000000
+ 64153894 × 80000000 that results in 5132311520000000

= 5461390651428138
