166666666667

166666666667 is a natural number. In decimal notation it is written as 166,666,666,667 and consists of twelve digits: a leading 1, followed by ten 6s, and ending with a 7. It lies in the range of 100 billion to 1 trillion, specifically near 1.67×10^11.

As a number, it is odd since it ends with 7. The sum of its digits is 68, which is not a multiple of 3 or 9, so the number is not divisible by 3 or 9. It does not end in 0 or 5, so it is not divisible by 5. Applying the 11-divisibility test yields a result of -6, indicating it is not divisible by 11. These basic tests show the number is not divisible by several small primes, though a full factorization would require more extensive computation.

In mathematics and computer science, 166666666667 is often used as an example of a large integer with a distinctive decimal pattern. Its digit sequence—a single 1, a long run of 6s, and a final 7—can serve in illustrating formatting, parsing, or arithmetic operations in educational materials and software testing. It does not have any widely recognized special constant or theorem associated with it.

Overall, 166666666667 is primarily notable for its characteristic decimal pattern and its role as a representative large integer in illustrative contexts.