666 (number) on 1/149 in base 10 has a magic total of 666. The prime factorization of 666 is 2 • 3 • 37. Also, 666 is the sum of squares of first seven primes: formula_2 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). In the Textus Receptus manuscripts of the New Testament, the Book of Revelation () cryptically asserts 666 to be "man's number" or "the number of a
Roman numerals union is often called the "1st XV", while a cricket or American football team for younger or less experienced players might be the "3rd XI". In tarot, Roman numerals (with zero) are used to denote the cards of the Major Arcana. In theology and biblical scholarship, the Septuagint is often referred to as "", as this translation of the Old Testament into Greek is named for the legendary number of its translators ("septuaginta" being Latin for "seventy"). Some uses that are rare or never seen in English speaking countries may be relatively common in parts of continental Europe. For instance: