25567000257 has 4 divisors (see below), whose sum is σ = 34089333680. Its totient is φ = 17044666836.

The previous prime is 25567000237. The next prime is 25567000297. The reversal of 25567000257 is 75200076552.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 25567000257 - 2¹⁰ = 25566999233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25567000237) 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, 4261166707 + ... + 4261166712.

It is an arithmetic number, because the mean of its divisors is an integer number (8522333420).

Almost surely, 2^25567000257 is an apocalyptic number.

It is an amenable number.

25567000257 is a deficient number, since it is larger than the sum of its proper divisors (8522333423).

25567000257 is an equidigital number, since it uses as much as digits as its factorization.

25567000257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8522333422.

The product of its (nonzero) digits is 147000, while the sum is 39.

The spelling of 25567000257 in words is "twenty-five billion, five hundred sixty-seven million, two hundred fifty-seven", and thus it is an aban number.