25879306009 has 4 divisors (see below), whose sum is σ = 25879889700. Its totient is φ = 25878722320.

The previous prime is 25879306007. The next prime is 25879306043. The reversal of 25879306009 is 90060397852.

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 18074113600 + 7805192409 = 134440^2 + 88347^2 .

It is a cyclic number.

It is not a de Polignac number, because 25879306009 - 2¹ = 25879306007 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25879306007) 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 in 3 ways as a sum of consecutive naturals, for example, 219334 + ... + 316015.

It is an arithmetic number, because the mean of its divisors is an integer number (6469972425).

Almost surely, 2^25879306009 is an apocalyptic number.

It is an amenable number.

25879306009 is a deficient number, since it is larger than the sum of its proper divisors (583691).

25879306009 is an equidigital number, since it uses as much as digits as its factorization.

25879306009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 583690.

The product of its (nonzero) digits is 816480, while the sum is 49.

The spelling of 25879306009 in words is "twenty-five billion, eight hundred seventy-nine million, three hundred six thousand, nine".