564430321561 has 4 divisors (see below), whose sum is σ = 564871628800. Its totient is φ = 563989014324.

The previous prime is 564430321541. The next prime is 564430321571. The reversal of 564430321561 is 165123034465.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 564430321561 - 2¹¹ = 564430319513 is a prime.

It is a super-2 number, since 2×564430321561² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (564430321501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220651701 + ... + 220654258.

It is an arithmetic number, because the mean of its divisors is an integer number (141217907200).

Almost surely, 2^564430321561 is an apocalyptic number.

It is an amenable number.

564430321561 is a deficient number, since it is larger than the sum of its proper divisors (441307239).

564430321561 is a wasteful number, since it uses less digits than its factorization.

564430321561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441307238.

The product of its (nonzero) digits is 259200, while the sum is 40.

The spelling of 564430321561 in words is "five hundred sixty-four billion, four hundred thirty million, three hundred twenty-one thousand, five hundred sixty-one".