25661895 has 16 divisors (see below), whose sum is σ = 46924800. Its totient is φ = 11731104.

The previous prime is 25661869. The next prime is 25661929. The reversal of 25661895 is 59816652.

It is not a de Polignac number, because 25661895 - 2⁸ = 25661639 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 122095 + ... + 122304.

It is an arithmetic number, because the mean of its divisors is an integer number (2932800).

Almost surely, 2^25661895 is an apocalyptic number.

25661895 is a deficient number, since it is larger than the sum of its proper divisors (21262905).

25661895 is a wasteful number, since it uses less digits than its factorization.

25661895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244414.

The product of its digits is 129600, while the sum is 42.

The square root of 25661895 is about 5065.7571003750. The cubic root of 25661895 is about 294.9598528148.

The spelling of 25661895 in words is "twenty-five million, six hundred sixty-one thousand, eight hundred ninety-five".