25959808513 has 4 divisors (see below), whose sum is σ = 26021471188. Its totient is φ = 25898145840.

The previous prime is 25959808481. The next prime is 25959808561. The reversal of 25959808513 is 31580895952.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 41062464 + 25918746049 = 6408^2 + 160993^2 .

It is a cyclic number.

It is not a de Polignac number, because 25959808513 - 2⁵ = 25959808481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25959808573) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30830706 + ... + 30831547.

It is an arithmetic number, because the mean of its divisors is an integer number (6505367797).

Almost surely, 2^25959808513 is an apocalyptic number.

It is an amenable number.

25959808513 is a deficient number, since it is larger than the sum of its proper divisors (61662675).

25959808513 is an equidigital number, since it uses as much as digits as its factorization.

25959808513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61662674.

The product of its (nonzero) digits is 3888000, while the sum is 55.

The spelling of 25959808513 in words is "twenty-five billion, nine hundred fifty-nine million, eight hundred eight thousand, five hundred thirteen".