5556561566 has 16 divisors (see below), whose sum is σ = 8546110848. Its totient is φ = 2708122200.

The previous prime is 5556561541. The next prime is 5556561581. The reversal of 5556561566 is 6651656555.

It is a congruent number.

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, 23570 + ... + 108021.

It is an arithmetic number, because the mean of its divisors is an integer number (534131928).

Almost surely, 2^5556561566 is an apocalyptic number.

5556561566 is a deficient number, since it is larger than the sum of its proper divisors (2989549282).

5556561566 is a wasteful number, since it uses less digits than its factorization.

5556561566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132127.

The product of its digits is 4050000, while the sum is 50.

The square root of 5556561566 is about 74542.3474677314. The cubic root of 5556561566 is about 1771.2045134141.

The spelling of 5556561566 in words is "five billion, five hundred fifty-six million, five hundred sixty-one thousand, five hundred sixty-six".