If you’re afraid of the number 6, particularly 666, then you have Hexakosioihexekontahexaphobia. You might especially notice this number more frequently than most and get upset seeing it on license plates, your library card, or your order number at a restaurant. A good example of it was when Ronald Reagan moved to a new house on 666 St. Cloud Road in Bel Air and he and his wife had the road changed to 668 St. Cloud Road due to concerns of Satan worship. They definitely had hexakosioihexekontahexaphobia.