566561556 has 36 divisors (see below), whose sum is σ = 1562337504. Its totient is φ = 171685200.

The previous prime is 566561539. The next prime is 566561561. The reversal of 566561556 is 655165665.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×566561556² = 641983993474282272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 714960 + ... + 715751.

It is an arithmetic number, because the mean of its divisors is an integer number (43398264).

Almost surely, 2^566561556 is an apocalyptic number.

It is an amenable number.

566561556 is an abundant number, since it is smaller than the sum of its proper divisors (995775948).

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

566561556 is a wasteful number, since it uses less digits than its factorization.

566561556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1430732 (or 1430727 counting only the distinct ones).

The product of its digits is 810000, while the sum is 45.

The square root of 566561556 is about 23802.5535604901. The cubic root of 566561556 is about 827.4638586151.

The spelling of 566561556 in words is "five hundred sixty-six million, five hundred sixty-one thousand, five hundred fifty-six".