8GCBC Pilot reported failure to read NOTAM and flew through an area of skydiving activity resulted in NMAC with a skydiver.

Narrative

I departed ZZZ1 in Aircraft X at approximately XA:25 am enroute to ZZZ2 as a fuel stop with a final destination of ZZZ3. After clearing ZZZ4 southeastern boundary of Class Bravo airspace; I climbed to 5500 ft. for the cruise to ZZZ2.The weather conditions were VFR.As I crossed over the top of ZZZ at 5500; I saw a skydiver pass directly in front of the aircraft. I do not know the horizontal distance between the aircraft and the skydiver; but I would estimate less than 150 ft.I had been monitoring ZZZ Approach. After the incident; I changed to the local frequency. Approximately 5 minutes after the near miss; I heard the Ground Operations asking the Jump Pilot if they were communicating with me. I replied that we were not in contact. Ground Operations advised me that there was a NOTAM for jumping operations. I responded that I had not checked the NOTAMs for ZZZ since I wasn't landing there. I had no further contact with Ground Operations; however; I heard them asking the Pilot of the jump plane to contact ZZZ1 Approach for more information about my aircraft. The Ground Ops person also referenced that there was video of the incident.I landed at ZZZ2 uneventfully for refueling.