25664871 has 4 divisors (see below), whose sum is σ = 34219832. Its totient is φ = 17109912.

The previous prime is 25664843. The next prime is 25664887. The reversal of 25664871 is 17846652.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 25664871 - 2¹³ = 25656679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25664371) 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, 4277476 + ... + 4277481.

It is an arithmetic number, because the mean of its divisors is an integer number (8554958).

Almost surely, 2^25664871 is an apocalyptic number.

25664871 is a deficient number, since it is larger than the sum of its proper divisors (8554961).

25664871 is an equidigital number, since it uses as much as digits as its factorization.

25664871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8554960.

The product of its digits is 80640, while the sum is 39.

The square root of 25664871 is about 5066.0508288015. The cubic root of 25664871 is about 294.9712545006.

The spelling of 25664871 in words is "twenty-five million, six hundred sixty-four thousand, eight hundred seventy-one".