Alright, let's work through 51798054 times 85009820 step by step
51798054 × 85009820 = 85009820 × (51798054)
+ 85009820 × 4 that is equal 340039280
+ 85009820 × 50 producing 4250491000
+ 85009820 × 000 that results in 0
+ 85009820 × 8000 which equals 680078560000
+ 85009820 × 90000 that results in 7650883800000
+ 85009820 × 700000 yielding 59506874000000
+ 85009820 × 1000000 that results in 85009820000000
+ 85009820 × 50000000 producing 4250491000000000

= 4403343246890280
