25556 has 6 divisors (see below), whose sum is σ = 44730. Its totient is φ = 12776.

The previous prime is 25541. The next prime is 25561. The reversal of 25556 is 65552.

It can be written as a sum of positive squares in only one way, i.e., 13456 + 12100 = 116^2 + 110^2 .

It is a plaindrome in base 10 and base 15.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3191 + ... + 3198.

It is an arithmetic number, because the mean of its divisors is an integer number (7455).

2²⁵⁵⁵⁶ is an apocalyptic number.

It is an amenable number.

25556 is a deficient number, since it is larger than the sum of its proper divisors (19174).

25556 is a wasteful number, since it uses less digits than its factorization.

25556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6393 (or 6391 counting only the distinct ones).

The product of its digits is 1500, while the sum is 23.

The square root of 25556 is about 159.8624408671. The cubic root of 25556 is about 29.4553571617.

The spelling of 25556 in words is "twenty-five thousand, five hundred fifty-six".