25550 has 24 divisors (see below), whose sum is σ = 55056. Its totient is φ = 8640.

The previous prime is 25541. The next prime is 25561. The reversal of 25550 is 5552.

It is a happy number.

25550 is nontrivially palindromic in base 8.

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 25550.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 314 + ... + 386.

It is an arithmetic number, because the mean of its divisors is an integer number (2294).

2²⁵⁵⁵⁰ is an apocalyptic number.

25550 is an abundant number, since it is smaller than the sum of its proper divisors (29506).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27528).

25550 is a wasteful number, since it uses less digits than its factorization.

25550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92 (or 87 counting only the distinct ones).

The product of its (nonzero) digits is 250, while the sum is 17.

The square root of 25550 is about 159.8436736315. The cubic root of 25550 is about 29.4530518195.

It can be divided in two parts, 25 and 550, that added together give a palindrome (575).

The spelling of 25550 in words is "twenty-five thousand, five hundred fifty".