you should know that 10^0 is 1, and for every negative exponent you shift the decimal point to the left 1 digit. The opposite is true for positive exponents.
That is more than a little confusing, why would they use 'e' to denote exponent when it is more widely recognised as the natural number e (which ≈ 2.718)?
Just out of curiosity, are you using the same formula as that for a solenoid? Are you using relative permeability - which I think might be your figure, the Permeability of Air, divided by the permeability of free space, 4*pi * 10^-7 T*m/A? I like to use * instead of x because I don't always know when x is referring to a cross product. I just wanted to make sure that by writing T*m/A I meant units - not variables.