25664797 has 6 divisors (see below), whose sum is σ = 26581178. Its totient is φ = 24778992.

The previous prime is 25664783. The next prime is 25664843. The reversal of 25664797 is 79746652.

It can be written as a sum of positive squares in 3 ways, for example, as 51076 + 25613721 = 226^2 + 5061^2 .

It is not a de Polignac number, because 25664797 - 2⁷ = 25664669 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 (25664767) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14418 + ... + 16099.

Almost surely, 2^25664797 is an apocalyptic number.

It is an amenable number.

25664797 is a deficient number, since it is larger than the sum of its proper divisors (916381).

25664797 is an equidigital number, since it uses as much as digits as its factorization.

25664797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30575 (or 30546 counting only the distinct ones).

The product of its digits is 635040, while the sum is 46.

The square root of 25664797 is about 5066.0435252769. The cubic root of 25664797 is about 294.9709710016.

The spelling of 25664797 in words is "twenty-five million, six hundred sixty-four thousand, seven hundred ninety-seven".