7665 has 16 divisors (see below), whose sum is σ = 14208. Its totient is φ = 3456.

The previous prime is 7649. The next prime is 7669. The reversal of 7665 is 5667.

7665 is nontrivially palindromic in base 8.

It is not a de Polignac number, because 7665 - 2⁴ = 7649 is a prime.

It is a Curzon number.

It is a plaindrome in base 9.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (7669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69 + ... + 141.

It is an arithmetic number, because the mean of its divisors is an integer number (888).

2⁷⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

7665 is a deficient number, since it is larger than the sum of its proper divisors (6543).

7665 is a wasteful number, since it uses less digits than its factorization.

7665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88.

The product of its digits is 1260, while the sum is 24.

The square root of 7665 is about 87.5499857224. The cubic root of 7665 is about 19.7168433685.

It can be divided in two parts, 76 and 65, that added together give a palindrome (141).

The spelling of 7665 in words is "seven thousand, six hundred sixty-five".