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 to for the smaller intervals. The sign " | 17" thus marks kilometre 17.9. A notable exception to the use of Roman numerals in Europe is in Greece, where Greek numerals (based on the Greek alphabet) are generally used in contexts where Roman numerals would be used elsewhere. The number zero does not have its own Roman numeral, but the word "nulla" (the Latin word meaning "none") was used by medieval scholars in lieu of 0. Dionysius Exiguus was known to use "nulla" alongside Roman numerals in 525. About 725, Bede or one of his colleagues used the letter N,