What does 666 mean?
666 comes from the Book of Revelation, which calls it the number of a beast. Scholars have long read it as a coded name, most often the Roman emperor Nero. Some of the oldest manuscripts give the number as 616 instead.
Last reviewed October 20, 2026
What each tradition says
The eastern Mediterranean, first century CE, and many branches since
Christian tradition
Revelation 13:18 tells the reader to calculate the number of the beast and says it is a human number. In Greek and Hebrew, letters also stood for numbers, so a name could be added up. A common scholarly reading is that 666 spells Nero Caesar when the name is written in Hebrew letters. A third-century papyrus and some other early copies read 616, which fits the same name spelled the Latin way, and Irenaeus in the second century already knew of both numbers.
Found everywhere, in every era, with no single point of origin
Folk omen custom
In popular custom today the number works as shorthand for evil, and some people avoid it on addresses and phone numbers. That is a result of how widely the verse is known, and it is a separate matter from what the verse meant to its first readers.
How to weigh it
If you keep seeing 666, the likeliest reason is that it is a number you recognize, so your eye catches it. Churches and scholars do not read the verse as a warning attached to ordinary sightings of the digits. Read it as a text with a history, and treat a sighting as a coincidence that happens to carry a heavy association.