561665324 has 12 divisors (see below), whose sum is σ = 1072270248. Its totient is φ = 255302400.

The previous prime is 561665311. The next prime is 561665333. The reversal of 561665324 is 423566165.

It is a happy 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, 6382517 + ... + 6382604.

It is an arithmetic number, because the mean of its divisors is an integer number (89355854).

Almost surely, 2^561665324 is an apocalyptic number.

It is an amenable number.

561665324 is a deficient number, since it is larger than the sum of its proper divisors (510604924).

561665324 is a wasteful number, since it uses less digits than its factorization.

561665324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12765136 (or 12765134 counting only the distinct ones).

The product of its digits is 129600, while the sum is 38.

The square root of 561665324 is about 23699.4794035650. The cubic root of 561665324 is about 825.0733079639.

The spelling of 561665324 in words is "five hundred sixty-one million, six hundred sixty-five thousand, three hundred twenty-four".