Surprise ! The result obtained in Step-4 is N itself !!Step-1: Add the digits of N.Step-2: Multiply the digits of N.Step-3: Multiply the result obtained in Step-1 by the result obtained in Step-2.Step-4: Multiply the result obtained in Step-3 by the units digit of N.

The value of N having this property is unique. What is that value? Prove that there are no others.

*** No computer programs.