25558 has 8 divisors (see below), whose sum is σ = 41328. Its totient is φ = 11784.

The previous prime is 25541. The next prime is 25561. The reversal of 25558 is 85552.

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

It is a super-3 number, since 3×25558³ = 50084328123336, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a plaindrome in base 10 and base 15.

It is a nialpdrome in base 13.

It is a congruent number.

It is an unprimeable number.

It is an upside-down number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 466 + ... + 517.

It is an arithmetic number, because the mean of its divisors is an integer number (5166).

2²⁵⁵⁵⁸ is an apocalyptic number.

25558 is a deficient number, since it is larger than the sum of its proper divisors (15770).

25558 is a wasteful number, since it uses less digits than its factorization.

25558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 998.

The product of its digits is 2000, while the sum is 25.

The square root of 25558 is about 159.8686961228. The cubic root of 25558 is about 29.4561255289.

It can be divided in two parts, 255 and 58, that added together give a palindrome (313).

The spelling of 25558 in words is "twenty-five thousand, five hundred fifty-eight".