The interpretation of 666 as the Antichrist is commonly accepted among many pastors. Examples:
Turning the number into a name is the key to unlocking the name of the Antichrist. Revelation 13:18 is the applicable verse: "This calls for wisdom. If anyone has insight, let him calculate the number of the beast, for it is man's number. His number is 666." According to John, those who are wise can get an insight into the Antichrist's identity by knowing the number of his name.
Source:
https://www.crosswalk.com/church/pa...what-is-the-meaning-of-666-in-revelation.html
When the name of the antichrist is known its gematria will doubtless be found to be the number 666.
https://prophecyinthenews.com/articles/fascinating-study-on-the-unholy-number-666/
And there are a great many books that make the equation:
https://www.amazon.com/s?url=search-alias=stripbooks&field-keywords=antichrist+666
While 666 = Antichrist may have more weight in popular culture than among scholars, popular culture itself can be a manifestation of the Spiritus Mundi or "Mind of God."
There are many antichrists...anyone who is against Jesus and his kingdom is considered an antichrist in the Bible...
BEWARE OF ANTICHRIST’S ACTIVITIES TODAY
What about today? People and organizations making up the antichrist still oppose Christ and his teachings. They deliberately spread lies and deceptions with the intent of confusing the identity of the Father, Jehovah God, and of His Son, Jesus Christ. We have good reason to beware of such religious deceptions. Let us look at two examples.
For centuries, the churches propagated the doctrine of the Trinity, claiming that the Father and the Son are part of the same entity. The antichrist thus shrouds in mystery the identity of Jehovah God and Jesus Christ. This mystery hinders sincere people from imitating Jesus Christ and drawing close to God, as the Bible encourages them to.—1 Corinthians 11:1; James 4:8.
The churches add to the confusion by promoting the use of Bible translations that omit God’s personal name, Jehovah, from the text. They do this despite the fact that the name Jehovah occurs some 7,000 times in the original text of the Bible. The result? The identity of the true God becomes even more shrouded in mystery.
On the other hand, knowing God’s name, Jehovah, has helped many honesthearted worshippers to draw closer to God. That was the experience of Richard, who recalls a conversation with two of Jehovah’s Witnesses. “They showed me from the Bible that the name of the true God is Jehovah,” explains Richard. “I was fascinated by the thought that God has a personal name, something I had never heard before.” From that point on, he made changes in his life to conform to Bible standards and to please Jehovah. “Learning God’s name has helped me to develop a close relationship with him.”
For centuries, the antichrist has kept millions in spiritual darkness. But by studying God’s Word, the Bible, we are able to learn the true identity of the antichrist and be set free from the antichrist’s religious lies and deceptions.—John 17:17.
https://wol.jw.org/en/wol/d/r1/lp-e/2015406