556111561 has 8 divisors (see below), whose sum is σ = 569455040. Its totient is φ = 542786832.

The previous prime is 556111559. The next prime is 556111601. The reversal of 556111561 is 165111655.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 556111561 - 2¹ = 556111559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (556111261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68980 + ... + 76618.

It is an arithmetic number, because the mean of its divisors is an integer number (71181880).

Almost surely, 2^556111561 is an apocalyptic number.

It is an amenable number.

556111561 is a deficient number, since it is larger than the sum of its proper divisors (13343479).

556111561 is a wasteful number, since it uses less digits than its factorization.

556111561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9375.

The product of its digits is 4500, while the sum is 31.

The square root of 556111561 is about 23582.0177465797. The cubic root of 556111561 is about 822.3448454732.

The spelling of 556111561 in words is "five hundred fifty-six million, one hundred eleven thousand, five hundred sixty-one".