25664505 has 16 divisors (see below), whose sum is σ = 41342400. Its totient is φ = 13594688.

The previous prime is 25664477. The next prime is 25664521. The reversal of 25664505 is 50546652.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 25664505 - 2⁹ = 25663993 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3507 + ... + 7976.

It is an arithmetic number, because the mean of its divisors is an integer number (2583900).

Almost surely, 2^25664505 is an apocalyptic number.

It is an amenable number.

25664505 is a deficient number, since it is larger than the sum of its proper divisors (15677895).

25664505 is a wasteful number, since it uses less digits than its factorization.

25664505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11640.

The product of its (nonzero) digits is 36000, while the sum is 33.

The square root of 25664505 is about 5066.0147058610. The cubic root of 25664505 is about 294.9698523247.

The spelling of 25664505 in words is "twenty-five million, six hundred sixty-four thousand, five hundred five".