Well, it is the mark of the beast; and if you take its mark and worship it (the beast), you go to hell. So, it's pretty bad. Also, the same number is mentioned several times in the Bible. I don't know what that means, but I don't think it is a coincidence.
14 Now the weight of gold that came to Solomon in one year was six hundred threescore and six talents of gold, - 1 Kings 10:14 (KJV)
13 Now the weight of gold that came to Solomon in one year was six hundred and threescore and six talents of gold; - 2 Chronicles 9:13 (KJV)
13 The children of Adonikam, six hundred sixty and six. - Ezra 2:13 (KJV)
18 Here is wisdom. 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. - Revelation 13:18 (KJV)
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