260661 has 16 divisors (see below), whose sum is σ = 388800. Its totient is φ = 154368.

The previous prime is 260651. The next prime is 260671. The reversal of 260661 is 166062.

260661 = 108² + 109² + ... + 126².

It is an interprime number because it is at equal distance from previous prime (260651) and next prime (260671).

It is not a de Polignac number, because 260661 - 2⁵ = 260629 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 260661.

It is not an unprimeable number, because it can be changed into a prime (260651) 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, 835 + ... + 1103.

It is an arithmetic number, because the mean of its divisors is an integer number (24300).

2²⁶⁰⁶⁶¹ is an apocalyptic number.

It is an amenable number.

260661 is a deficient number, since it is larger than the sum of its proper divisors (128139).

260661 is a wasteful number, since it uses less digits than its factorization.

260661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 260661 is about 510.5497037508. The cubic root of 260661 is about 63.8790848500.

The spelling of 260661 in words is "two hundred sixty thousand, six hundred sixty-one".