166666666666

166666666666 is a natural number in the decimal system. In standard written form with thousands separators, it is 166,666,666,666. The numeral consists of a leading 1 followed by eleven 6s, giving it a distinctive pattern of digits.

Basic arithmetic properties include that it is an even number, since the last digit is 6. It can be factored as 2 × 83,333,333,333. Because the sum of its digits is 1 + 11×6 = 67, it is not divisible by 3 or 9. Therefore the number is composite (not prime), with 2 as one of its factors.

In terms of magnitude, 166,666,666,666 is approximately 1.66666666666 × 10^11, or about 166.7 billion. Its size places it well above everyday quantities but far below astronomical scales.

Context and usage notes indicate that numbers with distinctive digit patterns such as this one are often used in examples, demonstrations, or test data in mathematics, computer science, and data formatting. There is no widely recognized mathematical constant or named significance attached specifically to this exact number; it is primarily notable for its digit pattern and its role as a large, even composite integer.

See also: repdigit concepts and large-integer representations.