561066646 has 16 divisors (see below), whose sum is σ = 1003647744. Its totient is φ = 230002344.

The previous prime is 561066619. The next prime is 561066677. The reversal of 561066646 is 646660165.

It is a junction number, because it is equal to n+sod(n) for n = 561066599 and 561066608.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 870900 + ... + 871543.

It is an arithmetic number, because the mean of its divisors is an integer number (62727984).

Almost surely, 2^561066646 is an apocalyptic number.

561066646 is a deficient number, since it is larger than the sum of its proper divisors (442581098).

561066646 is a wasteful number, since it uses less digits than its factorization.

561066646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1742475.

The product of its (nonzero) digits is 155520, while the sum is 40.

The square root of 561066646 is about 23686.8454210349. The cubic root of 561066646 is about 824.7800557239.

The spelling of 561066646 in words is "five hundred sixty-one million, sixty-six thousand, six hundred forty-six".