Hexakosioihexekontahexaphobia is a fear of the number 666. It comes from the Biblical verse Revelation 13:18, which says that the number 666 is the number of the beast, associated with Satan or the Antichrist.
A well-known example of this fear is Nancy and Ronald Reagan, who, in 1989, when moving to their home in Bel-Air, Los Angeles, had its address changed from 666 St. Cloud Road to 668 St. Cloud Road.
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- "THE REAGANS: First Family Easing Into Private Life". Los Angeles Times. Nov. 19, 1988. Check date values in:
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Supporters say changing building numbers isn't such an unusual thing. After all, they say, when President Reagan left office, he and Nancy took up residence at 666 St. Cloud Road in Bel-Air but had the address changed to 668 to avoid the 'number of the beast.'