9665 has 4 divisors (see below), whose sum is σ = 11604. Its totient is φ = 7728.

The previous prime is 9661. The next prime is 9677. The reversal of 9665 is 5669.

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 5041 + 4624 = 71^2 + 68^2 .

It is a cyclic number.

It is not a de Polignac number, because 9665 - 2² = 9661 is a prime.

It is an Ulam number.

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 (9661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 962 + ... + 971.

It is an arithmetic number, because the mean of its divisors is an integer number (2901).

2⁹⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

9665 is a deficient number, since it is larger than the sum of its proper divisors (1939).

9665 is a wasteful number, since it uses less digits than its factorization.

9665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1938.

The product of its digits is 1620, while the sum is 26.

The square root of 9665 is about 98.3107318659. The cubic root of 9665 is about 21.3010307568.

It can be divided in two parts, 96 and 65, that added together give a palindrome (161).

The spelling of 9665 in words is "nine thousand, six hundred sixty-five".