25528915556 has 72 divisors (see below), whose sum is σ = 47055375360. Its totient is φ = 12111001344.

The previous prime is 25528915553. The next prime is 25528915571. The reversal of 25528915556 is 65551982552.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a junction number, because it is equal to n+sod(n) for n = 25528915498 and 25528915507.

It is not an unprimeable number, because it can be changed into a prime (25528915553) 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 23 ways as a sum of consecutive naturals, for example, 66654941 + ... + 66655323.

It is an arithmetic number, because the mean of its divisors is an integer number (653546880).

Almost surely, 2^25528915556 is an apocalyptic number.

It is an amenable number.

25528915556 is a deficient number, since it is larger than the sum of its proper divisors (21526459804).

25528915556 is a wasteful number, since it uses less digits than its factorization.

25528915556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645 (or 570 counting only the distinct ones).

The product of its digits is 5400000, while the sum is 53.

The spelling of 25528915556 in words is "twenty-five billion, five hundred twenty-eight million, nine hundred fifteen thousand, five hundred fifty-six".