Walid Shoebat is a Palestinian, former PLO terrorist turned Christian. His view of 666 is remarkable.
https://www.youtube.com/watch?v=Rs_09o5j_pY The end of this video shows the Codex Vaticanus where 666 is written in the Greek.
https://www.youtube.com/watch?v=GtquNNEO7Fw
https://www.youtube.com/watch?v=uLp6HN8DNwg