What is the model number for a polaris 2006 sportsman vin 4xamh5oa16a661563?

The model number for a 2006 Polaris Sportsman can typically be found on the vehicle's identification plate, which is usually located near the front of the frame or on the right side near the seat. Based on the VIN you provided (4XAMH5OA16A661563), this corresponds to a 2006 Polaris Sportsman 500. However, for the exact model number, it's best to consult the owner's manual or contact a Polaris dealer for confirmation.