25638261703 has 4 divisors (see below), whose sum is σ = 25639850808. Its totient is φ = 25636672600.

The previous prime is 25638261659. The next prime is 25638261707. The reversal of 25638261703 is 30716283652.

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

It is a cyclic number.

It is not a de Polignac number, because 25638261703 - 2¹⁷ = 25638130631 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25638261703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25638261707) 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, 770101 + ... + 802702.

It is an arithmetic number, because the mean of its divisors is an integer number (6409962702).

Almost surely, 2^25638261703 is an apocalyptic number.

25638261703 is a deficient number, since it is larger than the sum of its proper divisors (1589105).

25638261703 is a wasteful number, since it uses less digits than its factorization.

25638261703 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1589104.

The product of its (nonzero) digits is 362880, while the sum is 43.

The spelling of 25638261703 in words is "twenty-five billion, six hundred thirty-eight million, two hundred sixty-one thousand, seven hundred three".