102665 has 4 divisors (see below), whose sum is σ = 123204. Its totient is φ = 82128.

The previous prime is 102653. The next prime is 102667. The reversal of 102665 is 566201.

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 53824 + 48841 = 232^2 + 221^2 .

It is a cyclic number.

It is not a de Polignac number, because 102665 - 2⁸ = 102409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102667) 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, 10262 + ... + 10271.

It is an arithmetic number, because the mean of its divisors is an integer number (30801).

2¹⁰²⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

102665 is a deficient number, since it is larger than the sum of its proper divisors (20539).

102665 is an equidigital number, since it uses as much as digits as its factorization.

102665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20538.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 102665 is about 320.4137949590. The cubic root of 102665 is about 46.8246065842.

Adding to 102665 its reverse (566201), we get a palindrome (668866).

It can be divided in two parts, 102 and 665, that added together give a palindrome (767).

The spelling of 102665 in words is "one hundred two thousand, six hundred sixty-five".