259665 has 16 divisors (see below), whose sum is σ = 475008. Its totient is φ = 118656.

The previous prime is 259657. The next prime is 259667. The reversal of 259665 is 566952.

It is not a de Polignac number, because 259665 - 2³ = 259657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (259667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1132 + ... + 1341.

It is an arithmetic number, because the mean of its divisors is an integer number (29688).

2²⁵⁹⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

259665 is a deficient number, since it is larger than the sum of its proper divisors (215343).

259665 is a wasteful number, since it uses less digits than its factorization.

259665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2488.

The product of its digits is 16200, while the sum is 33.

The square root of 259665 is about 509.5733509516. The cubic root of 259665 is about 63.7976191694.

The spelling of 259665 in words is "two hundred fifty-nine thousand, six hundred sixty-five".