25559 has 4 divisors (see below), whose sum is σ = 26040. Its totient is φ = 25080.

The previous prime is 25541. The next prime is 25561. The reversal of 25559 is 95552.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25559 - 2⁸ = 25303 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10 and base 15.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25579) 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, 149 + ... + 270.

It is an arithmetic number, because the mean of its divisors is an integer number (6510).

2²⁵⁵⁵⁹ is an apocalyptic number.

25559 is a deficient number, since it is larger than the sum of its proper divisors (481).

25559 is an equidigital number, since it uses as much as digits as its factorization.

25559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480.

The product of its digits is 2250, while the sum is 26.

The square root of 25559 is about 159.8718236588. The cubic root of 25559 is about 29.4565096975.

The spelling of 25559 in words is "twenty-five thousand, five hundred fifty-nine".