25554616556 has 24 divisors (see below), whose sum is σ = 51117997056. Its totient is φ = 10950100560.

The previous prime is 25554616543. The next prime is 25554616573. The reversal of 25554616556 is 65561645552.

It is a super-2 number, since 2×25554616556² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 94661 + ... + 245091.

It is an arithmetic number, because the mean of its divisors is an integer number (2129916544).

Almost surely, 2^25554616556 is an apocalyptic number.

It is an amenable number.

25554616556 is an abundant number, since it is smaller than the sum of its proper divisors (25563380500).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25554616556 is a wasteful number, since it uses less digits than its factorization.

25554616556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156509 (or 156507 counting only the distinct ones).

The product of its digits is 5400000, while the sum is 50.

The spelling of 25554616556 in words is "twenty-five billion, five hundred fifty-four million, six hundred sixteen thousand, five hundred fifty-six".