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
Vampire number number which has fangs that are also vampire numbers, an example of such a number is 1047527295416280 = 25198740 * 41570622 = (2940 * 8571) * (5601 * 7422) which is the lowest double vampire number. A roman numeral vampire number is roman numerals with the same character, an example of this number is II * IV = VIII. Vampire number In mathematics, a vampire number (or true vampire number) is a composite natural number with an even number of digits, that can be factored into two natural numbers each with half as many digits as the original number and