Alright, let's work through 8711973 times 15834525 step by step
8711973 × 15834525 = 15834525 × (8711973)
+ 15834525 × 3 what gives us 47503575
+ 15834525 × 70 giving us 1108416750
+ 15834525 × 900 what gives us 14251072500
+ 15834525 × 1000 that results in 15834525000
+ 15834525 × 10000 yielding 158345250000
+ 15834525 × 700000 which equals 11084167500000
+ 15834525 × 8000000 yielding 126676200000000

= 137949954267825
