561666673 has 4 divisors (see below), whose sum is σ = 561757680. Its totient is φ = 561575668.

The previous prime is 561666661. The next prime is 561666713. The reversal of 561666673 is 376666165.

561666673 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 561666673 - 2⁵ = 561666641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561666653) 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, 35515 + ... + 48832.

It is an arithmetic number, because the mean of its divisors is an integer number (140439420).

Almost surely, 2^561666673 is an apocalyptic number.

It is an amenable number.

561666673 is a deficient number, since it is larger than the sum of its proper divisors (91007).

561666673 is an equidigital number, since it uses as much as digits as its factorization.

561666673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91006.

The product of its digits is 816480, while the sum is 46.

The square root of 561666673 is about 23699.5078640887. The cubic root of 561666673 is about 825.0739685133.

The spelling of 561666673 in words is "five hundred sixty-one million, six hundred sixty-six thousand, six hundred seventy-three".