"10000" is the default setting for the camera. You can change it to whatever you need:
If you have to go really far back -- double click on the Far Plane value and type in the value you need (positive value -- it's automatically understood to be "back into z-space"). You could try starting with 100000 or 250000 and work backwards. If you click and drag on the value - hold the shift key down to use the highest "multiplier".