25508257613 has 2 divisors, whose sum is σ = 25508257614. Its totient is φ = 25508257612.

The previous prime is 25508257553. The next prime is 25508257637. The reversal of 25508257613 is 31675280552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25312173604 + 196084009 = 159098^2 + 14003^2 .

It is a cyclic number.

It is not a de Polignac number, because 25508257613 - 2¹⁰ = 25508256589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25508257673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12754128806 + 12754128807.

It is an arithmetic number, because the mean of its divisors is an integer number (12754128807).

Almost surely, 2^25508257613 is an apocalyptic number.

It is an amenable number.

25508257613 is a deficient number, since it is larger than the sum of its proper divisors (1).

25508257613 is an equidigital number, since it uses as much as digits as its factorization.

25508257613 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504000, while the sum is 44.

The spelling of 25508257613 in words is "twenty-five billion, five hundred eight million, two hundred fifty-seven thousand, six hundred thirteen".