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666 (''six hundred sixty-six'') is the natural number following 665 and preceding 667. Six hundred and sixty-six is called the "number of the beast" in (most manuscripts of) chapter of the Book of Revelation, of the New Testament,〔Beale, Gregory K. (1999). The Book of Revelation: A Commentary on the Greek Text. Grand Rapids, Michigan: Wm. B. Eerdmans Publishing. p. 718. ISBN 080282174X. Retrieved 9 July 2012.〕 and also in popular culture. == In mathematics == 666 is the sum of the first 36 natural numbers (i.e. ), and thus it is a triangular number. Notice that ; 15 and 21 are also triangular numbers; and . In base 10, 666 is a repdigit (and therefore a palindromic number) and a Smith number. A prime reciprocal magic square based on 1/149 in base 10 has a magic total of 666. The Roman numeral for 666, DCLXVI, has exactly one occurrence of all symbols whose value is less than 1000 in decreasing order (D = 500, C = 100, L = 50, X = 10, V = 5, I = 1). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「666 (number)」の詳細全文を読む スポンサード リンク
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