556166778 has 16 divisors (see below), whose sum is σ = 1112590080. Its totient is φ = 185346176.

The previous prime is 556166777. The next prime is 556166791. The reversal of 556166778 is 877661655.

556166778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 556166778.

It is not an unprimeable number, because it can be changed into a prime (556166771) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28618 + ... + 43946.

It is an arithmetic number, because the mean of its divisors is an integer number (69536880).

Almost surely, 2^556166778 is an apocalyptic number.

556166778 is an abundant number, since it is smaller than the sum of its proper divisors (556423302).

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

556166778 is a wasteful number, since it uses less digits than its factorization.

556166778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21381.

The product of its digits is 2116800, while the sum is 51.

The square root of 556166778 is about 23583.1884612747. The cubic root of 556166778 is about 822.3720617824.

The spelling of 556166778 in words is "five hundred fifty-six million, one hundred sixty-six thousand, seven hundred seventy-eight".