561065666 has 8 divisors (see below), whose sum is σ = 961826880. Its totient is φ = 240456708.

The previous prime is 561065651. The next prime is 561065693. The reversal of 561065666 is 666560165.

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

It is a Curzon number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 20038046 + ... + 20038073.

It is an arithmetic number, because the mean of its divisors is an integer number (120228360).

Almost surely, 2^561065666 is an apocalyptic number.

561065666 is a deficient number, since it is larger than the sum of its proper divisors (400761214).

561065666 is a wasteful number, since it uses less digits than its factorization.

561065666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40076128.

The product of its (nonzero) digits is 194400, while the sum is 41.

The square root of 561065666 is about 23686.8247344383. The cubic root of 561065666 is about 824.7795755166.

The spelling of 561065666 in words is "five hundred sixty-one million, sixty-five thousand, six hundred sixty-six".