556205561 has 8 divisors (see below), whose sum is σ = 560077824. Its totient is φ = 552343680.

The previous prime is 556205543. The next prime is 556205591. The reversal of 556205561 is 165502655.

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 556205561 - 2¹⁸ = 555943417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (556205591) 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, 126380 + ... + 130706.

It is an arithmetic number, because the mean of its divisors is an integer number (70009728).

Almost surely, 2^556205561 is an apocalyptic number.

It is an amenable number.

556205561 is a deficient number, since it is larger than the sum of its proper divisors (3872263).

556205561 is a wasteful number, since it uses less digits than its factorization.

556205561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5191.

The product of its (nonzero) digits is 45000, while the sum is 35.

The square root of 556205561 is about 23584.0107064087. The cubic root of 556205561 is about 822.3911767407.

The spelling of 556205561 in words is "five hundred fifty-six million, two hundred five thousand, five hundred sixty-one".