6665

6665 is a natural number that follows 6664 and precedes 6666. In common decimal notation, it is written as 6665 and is classified as an odd composite integer.

Its prime factorization is 5 × 31 × 43, which shows that 6665 is squarefree and has eight positive divisors. It is divisible by 5, but not by 2 or 3; the digit sum is 23, so it is not divisible by 3 or 9. The Euler totient of 6665 is 5040.

In base representations, 6665 equals 1101000001001 in binary, 0x1A09 in hexadecimal, and 15011 in octal. These forms are relevant in computer science and digital arithmetic.

As an example in number theory, 6665 is used to illustrate factorization, divisor counting, and modular arithmetic properties of a product of distinct primes.