ArcPy on 64 bit Windows

Question

I can't import arcpy into 64 bit Python. It works just fine in the python install from arcGIS, though. When I try to import it elsewhere, I get this error:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Program Files (x86)\ArcGIS\Desktop10.2\arcpy\arcpy\__init__.py", line 21, in <module>
from arcpy.geoprocessing import gp
  File "C:\Program Files (x86)\ArcGIS\Desktop10.2\arcpy\arcpy\geoprocessing\__init__.py", line 14, in <module>
from _base import *
  File "C:\Program Files (x86)\ArcGIS\Desktop10.2\arcpy\arcpy\geoprocessing\_base.py", line 14, in <module>
import arcgisscripting
ImportError: DLL load failed: %1 is not a valid Win32 application.

I've been looking for a solution, but what I'm finding seems to be "too bad, doesn't work in 64-bit." Is this the case?

Edit: working with ArcGIS 10.2.2, Python 2.7.8

Edit: I believe the problem is that I only have the trial version of ArcMap, which apparently doesn't support the 64-bit background geoprocessing installation