67 (number)
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67 is a natural number (a whole counting number) that comes after 66 and before 68. It is written in standard Hindu-Arabic numerals as a two-digit number: 6 and 7. In the decimal system, 67 consists of six tens and seven ones.
In mathematics, 67 is classified as a prime number—meaning it cannot be divided by any other whole number except 1 and itself. It is the 19th prime number, counting from 2.
Mathematical properties
Because 67 is prime, its only divisors are 1 and 67. The sum of its digits (6+7) equals 13, which is also prime. 67 is an odd number, since it cannot be divided by two.
When written in the binary system, 67 is 1000011. In hexadecimal it is 43. In Roman numerals it is written as LXVII.
Other uses
Numbers such as 67 are used in administrative and scientific nomenclature. For example, in the periodic table of chemical elements, atomic number 67 corresponds to holmium, one of the lanthanide elements. Many countries also use numbers of this kind as designations for regions or roads.