561665326 has 8 divisors (see below), whose sum is σ = 842903424. Its totient is φ = 280697520.

The previous prime is 561665311. The next prime is 561665333. The reversal of 561665326 is 623566165.

It is a happy number.

561665326 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62295 + ... + 70738.

It is an arithmetic number, because the mean of its divisors is an integer number (105362928).

Almost surely, 2^561665326 is an apocalyptic number.

561665326 is a deficient number, since it is larger than the sum of its proper divisors (281238098).

561665326 is a wasteful number, since it uses less digits than its factorization.

561665326 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135146.

The product of its digits is 194400, while the sum is 40.

The square root of 561665326 is about 23699.4794457600. The cubic root of 561665326 is about 825.0733089432.

The spelling of 561665326 in words is "five hundred sixty-one million, six hundred sixty-five thousand, three hundred twenty-six".