25640987980613 has 2 divisors, whose sum is σ = 25640987980614. Its totient is φ = 25640987980612.

The previous prime is 25640987980607. The next prime is 25640987980637. The reversal of 25640987980613 is 31608978904652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18557123608804 + 7083864371809 = 4307798^2 + 2661553^2 .

It is a cyclic number.

It is not a de Polignac number, because 25640987980613 - 2¹⁶ = 25640987915077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25640987988613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12820493990306 + 12820493990307.

It is an arithmetic number, because the mean of its divisors is an integer number (12820493990307).

It is a 1-persistent number, because it is pandigital, but 2⋅25640987980613 = 51281975961226 is not.

Almost surely, 2^{25640987980613} is an apocalyptic number.

It is an amenable number.

25640987980613 is a deficient number, since it is larger than the sum of its proper divisors (1).

25640987980613 is an equidigital number, since it uses as much as digits as its factorization.

25640987980613 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 156764160, while the sum is 68.

The spelling of 25640987980613 in words is "twenty-five trillion, six hundred forty billion, nine hundred eighty-seven million, nine hundred eighty thousand, six hundred thirteen".