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
Macedonian numerals / "trilion" (trillion) etc. and they are formed as the other Macedonian numerals. The forming of the ordinal numerals depends on the gender of the numeral. To form the ordinal numerals we add -ti (m.), -ta (f.), -to (n.) to the basic numeral. Exception to this rule are the ordinal numerals first, second and third. If the basic word ends on the letter "t" and we add the suffixes for ordinal numerals, then a double "t" is generally produced. For the ordinal numerals "seventh" and "eighth", we reduce some of the letters of the basic number, for example: osum >