I think I count 33 legitimate 18/00, so that means there should be 712,800 characters out there without it (just using statistics).
My brother who was really lucky with the dice did it, he also rolled maximum human size and weight using the alternate rules in the DMG. So he was almost 8 foot tall and over 400 lbs. Just enough to not take size L damage from weapons. He named him Hercules.