25561634 has 24 divisors (see below), whose sum is σ = 45079020. Its totient is φ = 10838016.

The previous prime is 25561621. The next prime is 25561643. The reversal of 25561634 is 43616552.

It can be written as a sum of positive squares in 2 ways, for example, as 22992025 + 2569609 = 4795^2 + 1603^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 25561634.

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, 8162 + ... + 10850.

Almost surely, 2^25561634 is an apocalyptic number.

25561634 is a deficient number, since it is larger than the sum of its proper divisors (19517386).

25561634 is a wasteful number, since it uses less digits than its factorization.

25561634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2802 (or 2795 counting only the distinct ones).

The product of its digits is 21600, while the sum is 32.

The square root of 25561634 is about 5055.8514614257. The cubic root of 25561634 is about 294.5752154959.

The spelling of 25561634 in words is "twenty-five million, five hundred sixty-one thousand, six hundred thirty-four".