550561561 has 8 divisors (see below), whose sum is σ = 600801984. Its totient is φ = 500352720.

The previous prime is 550561513. The next prime is 550561567. The reversal of 550561561 is 165165055.

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 550561561 - 2⁹ = 550561049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (550561567) 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, 42676 + ... + 54058.

It is an arithmetic number, because the mean of its divisors is an integer number (75100248).

Almost surely, 2^550561561 is an apocalyptic number.

It is an amenable number.

550561561 is a deficient number, since it is larger than the sum of its proper divisors (50240423).

550561561 is a wasteful number, since it uses less digits than its factorization.

550561561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15791.

The product of its (nonzero) digits is 22500, while the sum is 34.

The square root of 550561561 is about 23464.0482653782. The cubic root of 550561561 is about 819.6000235526.

The spelling of 550561561 in words is "five hundred fifty million, five hundred sixty-one thousand, five hundred sixty-one".