Hexakosioihexekontahexaphobia

Hexakosioihexekontahexaphobia is an intense fear or aversion to the number 666. Its name combines Greek roots for six hundred, sixty, six, and fear.

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Number of the Beast: In the Book of Revelation, the number 666 is identified as the number of the beast. This biblical identification is the main source of 666’s ominous associations.
Specific phobia: A specific phobia is a persistent, excessive fear of a particular object or situation that causes distress or impairment. It is the clinical category under which a severe number-specific fear may be assessed.
Fear of Friday the 13th: Fear of Friday the 13th is aversion to a date associated with bad luck in some cultures. It resembles 666-related avoidance while attaching fear to a calendar date.
Diagnostic and Statistical Manual of Mental Disorders: The Diagnostic and Statistical Manual of Mental Disorders is a psychiatric classification manual published by the American Psychiatric Association. It supplies diagnostic criteria, but does not list this fear as a separate named disorder.
Book of Revelation: The final book of the New Testament presents apocalyptic visions, symbolic figures, and judgments. Its imagery gives the fear of 666 much of its religious context.
Numerophobia: Numerophobia is fear or aversion directed toward numbers or mathematics. It is a broader number-related fear that can include aversion to 666.
Highway 666: U.S. Route 666 was a highway designation discontinued in 2003 and replaced by U.S. Route 491. The route’s number became controversial partly because of its association with the beast.
Fear conditioning: Fear conditioning is learning to associate a stimulus with an aversive event. It offers one mechanism by which a number can acquire a strong fear response.
Christian eschatology: Christian eschatology concerns beliefs about death, final judgment, and the end of the world. Apocalyptic expectations can make the number’s symbolism feel consequential.
Triskaidekaphobia: Triskaidekaphobia is fear or aversion to the number thirteen. It provides a parallel example of number-specific fear shaped by cultural beliefs.