Alright, let's work through 51086094 times 83893309 step by step
51086094 × 83893309 = 83893309 × (51086094)
+ 83893309 × 4 what gives us 335573236
+ 83893309 × 90 producing 7550397810
+ 83893309 × 000 that equals 0
+ 83893309 × 6000 resulting in 503359854000
+ 83893309 × 80000 yielding 6711464720000
+ 83893309 × 000000 yielding 0
+ 83893309 × 1000000 giving us 83893309000000
+ 83893309 × 50000000 what gives us 4194665450000000

= 4285781469545046
