It's equivalent is itself. If you are a mathematician asking this is somewhat unusual.
Itself because 345/345 = 1
The product of 345 depends on what you are multiplying it by. If you meant to find the product of 345 and another number, please specify that number. If you are asking for the product of 345 by itself, the result would be 345 multiplied by 1, which is simply 345.
By any of its factors including itself
345 ÷ 15 = 23
345 rounded to the nearest tenth is 345. There is no change.
172 with 1 remainder
345/18=19 hrs 10 minutes
If you mean factors 5,1,69,345 if your talking logic any number between 0-345
Oh, isn't that a lovely number? Let's turn 345 into a fraction in its simplest form. We can write it as 345/1 because any number divided by 1 is the number itself. And that's all there is to it, just a simple and beautiful fraction.
111,111,111 x 111,111,111
It is: 111,111,1112 = 12,345,678,987,456,321
The number is: 111,111,111