25563321172 has 12 divisors (see below), whose sum is σ = 44737622356. Its totient is φ = 12781143360.

The previous prime is 25563321149. The next prime is 25563321241. The reversal of 25563321172 is 27112336552.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 204032656 + 25359288516 = 14284^2 + 159246^2 .

It is a congruent number.

It is an unprimeable number.

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, 4779 + ... + 226162.

Almost surely, 2^25563321172 is an apocalyptic number.

It is an amenable number.

25563321172 is a deficient number, since it is larger than the sum of its proper divisors (19174301184).

25563321172 is a wasteful number, since it uses less digits than its factorization.

25563321172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258618 (or 258616 counting only the distinct ones).

The product of its digits is 75600, while the sum is 37.

The spelling of 25563321172 in words is "twenty-five billion, five hundred sixty-three million, three hundred twenty-one thousand, one hundred seventy-two".