561503866 has 16 divisors (see below), whose sum is σ = 1050085440. Its totient is φ = 218767680.

The previous prime is 561503857. The next prime is 561503909. The reversal of 561503866 is 668305165.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1822911 + ... + 1823218.

It is an arithmetic number, because the mean of its divisors is an integer number (65630340).

Almost surely, 2^561503866 is an apocalyptic number.

561503866 is a deficient number, since it is larger than the sum of its proper divisors (488581574).

561503866 is a wasteful number, since it uses less digits than its factorization.

561503866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3646149.

The product of its (nonzero) digits is 129600, while the sum is 40.

The square root of 561503866 is about 23696.0727969847. The cubic root of 561503866 is about 824.9942410372.

The spelling of 561503866 in words is "five hundred sixty-one million, five hundred three thousand, eight hundred sixty-six".