25508225279 has 4 divisors (see below), whose sum is σ = 26617278576. Its totient is φ = 24399171984.

The previous prime is 25508225251. The next prime is 25508225311. The reversal of 25508225279 is 97252280552.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25508225279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25508225219) 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 in 3 ways as a sum of consecutive naturals, for example, 554526614 + ... + 554526659.

It is an arithmetic number, because the mean of its divisors is an integer number (6654319644).

Almost surely, 2^25508225279 is an apocalyptic number.

25508225279 is a deficient number, since it is larger than the sum of its proper divisors (1109053297).

25508225279 is a wasteful number, since it uses less digits than its factorization.

25508225279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1109053296.

The product of its (nonzero) digits is 1008000, while the sum is 47.

The spelling of 25508225279 in words is "twenty-five billion, five hundred eight million, two hundred twenty-five thousand, two hundred seventy-nine".