On reddit, there's a post about how 666 is mistranslated as 616 in Revelation (thread). However, someone posted this very interesting comment which I thought I would share here:
666 and 616 are both correct. If you read into revelations, very little is presented as actual prophecy- it's an analogous tale to describe the roman empire during their persecution of Christianity.
666 and 616 come from the Hebrew tradition of converting words into numerical values. The Roman emporer, Nero, can either be written as נרון קסר (Neron Kaiser), or נרו קסר (Nero Caeser), which numerically represent 666 and 616 respectively.
This becomes more evident as you read the description of the beast;
And there are seven kings: five are fallen, and one is, and the other is not yet come; and when he cometh, he must continue a short space.
The 7 kings are the emporer's of rome, Julius, Augustus, Tiberius, Caligula and Claudius are the kings who have fallen, Nero is the one who is being described, and Galba was to succeed him (remember, this was a retelling, not a prophecy.
And there was given unto him a mouth speaking great things and blasphemies
Which is likely a reference to the roman emperor worship, and how Nero called himself the sun god Apollo
and power was given unto him to continue forty and two months.
As Nero's campaign against christianity began in 64 AD and ended 3 and a half years later.
and the final line makes it obvious that the number was made to that end:
Let him that hath understanding count the number of the beast: for it is the number of a man; and his number is Six hundred threescore and six.
ie, if you know how our system works, it should be obvious what we're talking about.
tl;dr, there's a large school of thought that the revelations section of the new testament is not a description of a coming apocalypse, but a teaching of the origins of Christianity, and their struggle with roman persecution.
You can see the comment here. I have never heard of this, and it is apparantly the preterism view of Revelation. IMO it makes a lot of sense viewing Revelation from this point of view. Just thought I'd share the comment.