It isn't unusual for amateur stations to benefit from additional filtering to eliminate strong AM broadcast stations.  It isn't unusual for a 160 meter to pick up as much as a watt of signal--more than enough to light a flashlight!  In some cases, the receiver has minimal bandpass filtering, relying on low pass filtering and the absence of strong MF/LF signals.

• Reducing Broadcast Station Interference (502,608 bytes, PDF file)
  Build a BCI filter as shown in this 1976 ARRL Handbook article
• Bandstop Filters for Attenuating High-Level Broadcast-Band Signals 
• Dealing With AM Broadcast Band Interference To Your Receiver (35,599 bytes, PDF file)
  Joe Carr's Radio Tech Notes
• FAQ about Radio Frequency Interference (RFI)
  From station KOA at 850 AM in Denver, CO.

• Morgan Manufacturing BCB Interference Filters
• DLW Associates AM Broadcast Band (BCB) Reject Brick-Wall High Pass Filter

• V-Soft Communications® LLC
  Provides AM FM Zip Code Based Signal Strengths: Field strength vs. Zip Code
• DLW Associates
  An in-line high-pass filter to prevent strong AM stations from oveloading a receiver