What is the phobia of the number 666?

Revelation chapter 13 talks of the number of the name of the beast, and verse 18 in most modern Bibles gives this number as 666. However, some early manuscripts give the number of the beast as 616. The reason for this number is unclear, but some believe that by attributing a number to each letter of the alphabet, it probably identifies a Roman emperor or some other enemy.

The term for the phobia is 'Hexakosioihexekontahexaphobia.'