25318236613 has 2 divisors, whose sum is σ = 25318236614. Its totient is φ = 25318236612.

The previous prime is 25318236577. The next prime is 25318236659. The reversal of 25318236613 is 31663281352.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21509742244 + 3808494369 = 146662^2 + 61713^2 .

It is a cyclic number.

It is not a de Polignac number, because 25318236613 - 2⁹ = 25318236101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25318237613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12659118306 + 12659118307.

It is an arithmetic number, because the mean of its divisors is an integer number (12659118307).

Almost surely, 2^25318236613 is an apocalyptic number.

It is an amenable number.

25318236613 is a deficient number, since it is larger than the sum of its proper divisors (1).

25318236613 is an equidigital number, since it uses as much as digits as its factorization.

25318236613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 155520, while the sum is 40.

The spelling of 25318236613 in words is "twenty-five billion, three hundred eighteen million, two hundred thirty-six thousand, six hundred thirteen".