8665 has 4 divisors (see below), whose sum is σ = 10404. Its totient is φ = 6928.

The previous prime is 8663. The next prime is 8669. The reversal of 8665 is 5668.

8665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3481 + 5184 = 59^2 + 72^2 .

It is a cyclic number.

It is not a de Polignac number, because 8665 - 2¹ = 8663 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (8663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 862 + ... + 871.

It is an arithmetic number, because the mean of its divisors is an integer number (2601).

2⁸⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

8665 is a deficient number, since it is larger than the sum of its proper divisors (1739).

8665 is a wasteful number, since it uses less digits than its factorization.

It is an anagram of its base 11 representation: 8665 = (6568)₁₁.

8665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1738.

The product of its digits is 1440, while the sum is 25.

The square root of 8665 is about 93.0859817588. The cubic root of 8665 is about 20.5394836901.

Subtracting from 8665 its product of digits (1440), we obtain a square (7225 = 85²).

It can be divided in two parts, 86 and 65, that added together give a palindrome (151).

The spelling of 8665 in words is "eight thousand, six hundred sixty-five".