It's equivalent is itself. If you are a mathematician asking this is somewhat unusual.
Itself because 345/345 = 1
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
111,111,111 x 111,111,111
It is: 111,111,1112 = 12,345,678,987,456,321
The number is: 111,111,111
345 = 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.