25285251613 has 2 divisors, whose sum is σ = 25285251614. Its totient is φ = 25285251612.

The previous prime is 25285251521. The next prime is 25285251617. The reversal of 25285251613 is 31615258252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21495371769 + 3789879844 = 146613^2 + 61562^2 .

It is a cyclic number.

It is not a de Polignac number, because 25285251613 - 2²⁵ = 25251697181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25285251617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12642625806 + 12642625807.

It is an arithmetic number, because the mean of its divisors is an integer number (12642625807).

Almost surely, 2^25285251613 is an apocalyptic number.

It is an amenable number.

25285251613 is a deficient number, since it is larger than the sum of its proper divisors (1).

25285251613 is an equidigital number, since it uses as much as digits as its factorization.

25285251613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 144000, while the sum is 40.

The spelling of 25285251613 in words is "twenty-five billion, two hundred eighty-five million, two hundred fifty-one thousand, six hundred thirteen".