Alright, let's work through 66786954 times 87777999 step by step
66786954 × 87777999 = 87777999 × (66786954)
+ 87777999 × 4 what gives us 351111996
+ 87777999 × 50 giving us 4388899950
+ 87777999 × 900 that results in 79000199100
+ 87777999 × 6000 that equals 526667994000
+ 87777999 × 80000 resulting in 7022239920000
+ 87777999 × 700000 that is equal 61444599300000
+ 87777999 × 6000000 yielding 526667994000000
+ 87777999 × 60000000 what gives us 5266679940000000

= 5862425181425046
