Hexakosioihexekontahexaphobia is fear of the number 666, which is linked to Satan and the Antichrist in the Book of Revelation.
Unfortunately, it’s rather hard to avoid. 666 is the sum of the squares of the first seven primes:
666 = 22 + 32 + 52 + 72 + 112 + 132 + 172
Also:
666 = 1 + 2 + 3 + 4 + 567 + 89
= 123 + 456 + 78 + 9
= 9 + 87 + 6 + 543 + 21
= 13 + 23 + 33 + 43 + 53 + 63 + 53 + 43 + 33 + 23 + 13
In 1989, after his second term as president, Ronald and Nancy Reagan moved to a new home in the Bel-Air section of Los Angeles. They had the address, 666 St. Cloud Road, changed to 668 St. Cloud Road.