HELP with current in loops and solenoids

[BuBbLeS01]

Homework Statement

You have a 1.1-m-long copper wire.You want to make an N-turn current loop that generates a 1.66 mT magnetic field at the center when the current is 1.01 A. You must use the entire wire. What will be the diameter of your coil?

Homework Equations

The Attempt at a Solution

I figured that this is a solenoid so I tried starting off by finding the number of turns it would take by using this equation...
LB/UI = N
The U is Mue 1.257x10^-6
I got 1438.28
but now I don't know what to do?

 

[BuBbLeS01]

does anyone know what to do for this problem?