25256565017 has 2 divisors, whose sum is σ = 25256565018. Its totient is φ = 25256565016.

The previous prime is 25256565001. The next prime is 25256565041. The reversal of 25256565017 is 71056565252.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20251851481 + 5004713536 = 142309^2 + 70744^2 .

It is a cyclic number.

It is not a de Polignac number, because 25256565017 - 2⁴ = 25256565001 is a prime.

It is a super-3 number, since 3×25256565017³ (a number of 32 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (25256568017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12628282508 + 12628282509.

It is an arithmetic number, because the mean of its divisors is an integer number (12628282509).

Almost surely, 2^25256565017 is an apocalyptic number.

It is an amenable number.

25256565017 is a deficient number, since it is larger than the sum of its proper divisors (1).

25256565017 is an equidigital number, since it uses as much as digits as its factorization.

25256565017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 630000, while the sum is 44.

The spelling of 25256565017 in words is "twenty-five billion, two hundred fifty-six million, five hundred sixty-five thousand, seventeen".