Alright, let's work through 87042157 times 78165538 step by step
87042157 × 78165538 = 78165538 × (87042157)
+ 78165538 × 7 resulting in 547158766
+ 78165538 × 50 what gives us 3908276900
+ 78165538 × 100 that equals 7816553800
+ 78165538 × 2000 that is equal 156331076000
+ 78165538 × 40000 that is equal 3126621520000
+ 78165538 × 000000 that equals 0
+ 78165538 × 7000000 producing 547158766000000
+ 78165538 × 80000000 which equals 6253243040000000

= 6803697030585466
