The Number of the Beast is a concept from the Book of Revelation of the New Testament of the Christian Bible, relating to the figure of "The Beast". The number is 666 in most manuscripts of the New Testament and in modern translations while critical editions of the Greek text (such as the Novum Testamentum Graece) also note 616 as a variant.
In the Old Testament, both 1 Kings 10:14 and 2 Chronicles 9:13 state that Solomon collected "six hundred threescore and six" talents of gold each year. John's reference to "wisdom" and "understanding" might also point toward Proverbs 1 and 2, where understanding, discernment, wisdom and insight are explained and advised by King Solomon. In the Greek manuscripts, the number is rendered in Greek numerical form as χξϛʹ, or sometimes literally as ἑξακόσιοι ἑξήκοντα ἕξ, hexakósioi hexēkonta héx, "six hundred and sixty-six".
There are several interpretations-translations for the meaning of the phrase "Let him that hath understanding count the number of the beast" where the peculiar Greek word ψηφισάτω (psefisato) is used. Possible translations include not only "to count", "to reckon" but also "to vote" or "to decide".
Although Irenaeus (2nd century AD) affirmed the number to be 666 and reported several scribal errors of the number, there is still doubt by a minority of theologians about the original reading.
The beast is Satan. He will appear to people as a glorious being and he claims to be God. He will have many names, all of which are different names for God. In fact, he will have a total of six hundred and sixty-six (666) names.When he first comes to earth he will have 7 blasphemous names and over the next few months he will accumulate more and more names until he reaches 666 blasphemous names. When you count up all of his names the number will add up to 666.
Also, the number represents the essential number of a man. The number 6 falls one short of God's perfect number, 7, and thus points to human imperfection. Antichrist, the most powerful human the world will ever know, will still be a man - a 6. The ultimate in human and demonic power is a 6, not perfect, as God is.
The Beast out of the Sea
And I saw a beast coming out of the sea. He had ten horns and seven heads, with ten crowns on his horns, and on each head a blasphemous name. 2The beast I saw resembled a leopard, but had feet like those of a bear and a mouth like that of a lion. The dragon gave the beast his power and his throne and great authority. 3One of the heads of the beast seemed to have had a fatal wound, but the fatal wound had been healed. The whole world was astonished and followed the beast. 4Men worshiped the dragon because he had given authority to the beast, and they also worshiped the beast and asked, "Who is like the beast? Who can make war against him?" 5The beast was given a mouth to utter proud words and blasphemies and to exercise his authority for forty-two months. 6He opened his mouth to blaspheme God, and to slander his name and his dwelling place and those who live in heaven. 7He was given power to make war against the saints and to conquer them. And he was given authority over every tribe, people, language and nation. 8All inhabitants of the earth will worship the beast—all whose names have not been written in the book of life belonging to the Lamb that was slain from the creation of the world. 9He who has an ear, let him hear. 10If anyone is to go into captivity, into captivity he will go. If anyone is to be killed with the sword, with the sword he will be killed. This calls for patient endurance and faithfulness on the part of the saints.11Then I saw another beast, coming out of the earth. He had two horns like a lamb, but he spoke like a dragon. 12He exercised all the authority of the first beast on his behalf, and made the earth and its inhabitants worship the first beast, whose fatal wound had been healed. 13And he performed great and miraculous signs, even causing fire to come down from heaven to earth in full view of men. 14Because of the signs he was given power to do on behalf of the first beast, he deceived the inhabitants of the earth. He ordered them to set up an image in honor of the beast who was wounded by the sword and yet lived. 15He was given power to give breath to the image of the first beast, so that it could speak and cause all who refused to worship the image to be killed. 16He also forced everyone, small and great, rich and poor, free and slave, to receive a mark on his right hand or on his forehead, 17so that no one could buy or sell unless he had the mark, which is the name of the beast or the number of his name. 18This 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.