25561056 has 24 divisors (see below), whose sum is σ = 67098024. Its totient is φ = 8520320.

The previous prime is 25561051. The next prime is 25561057. The reversal of 25561056 is 65016552.

It is a tau number, because it is divible by the number of its divisors (24).

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25561051) 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, 133035 + ... + 133226.

It is an arithmetic number, because the mean of its divisors is an integer number (2795751).

Almost surely, 2^25561056 is an apocalyptic number.

It is an amenable number.

25561056 is an abundant number, since it is smaller than the sum of its proper divisors (41536968).

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

25561056 is a wasteful number, since it uses less digits than its factorization.

25561056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266274 (or 266266 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 30.

The square root of 25561056 is about 5055.7942996131. The cubic root of 25561056 is about 294.5729951663.

The spelling of 25561056 in words is "twenty-five million, five hundred sixty-one thousand, fifty-six".