260665 has 8 divisors (see below), whose sum is σ = 321480. Its totient is φ = 202752.

The previous prime is 260651. The next prime is 260671. The reversal of 260665 is 566062.

It can be written as a sum of positive squares in 4 ways, for example, as 11664 + 249001 = 108^2 + 499^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 260665 - 2¹¹ = 258617 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 520 + ... + 889.

It is an arithmetic number, because the mean of its divisors is an integer number (40185).

2²⁶⁰⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

260665 is a deficient number, since it is larger than the sum of its proper divisors (60815).

260665 is a wasteful number, since it uses less digits than its factorization.

260665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1451.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 260665 is about 510.5536210821. The cubic root of 260665 is about 63.8794116027.

The spelling of 260665 in words is "two hundred sixty thousand, six hundred sixty-five".