25161564 has 24 divisors (see below), whose sum is σ = 62164368. Its totient is φ = 7893760.

The previous prime is 25161551. The next prime is 25161571. The reversal of 25161564 is 46516152.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61467 + ... + 61874.

It is an arithmetic number, because the mean of its divisors is an integer number (2590182).

Almost surely, 2^25161564 is an apocalyptic number.

It is an amenable number.

25161564 is an abundant number, since it is smaller than the sum of its proper divisors (37002804).

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

25161564 is a wasteful number, since it uses less digits than its factorization.

25161564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123365 (or 123363 counting only the distinct ones).

The product of its digits is 7200, while the sum is 30.

The square root of 25161564 is about 5016.1303810806. The cubic root of 25161564 is about 293.0303097782.

The spelling of 25161564 in words is "twenty-five million, one hundred sixty-one thousand, five hundred sixty-four".