561665303 has 2 divisors, whose sum is σ = 561665304. Its totient is φ = 561665302.

The previous prime is 561665297. The next prime is 561665311. The reversal of 561665303 is 303566165.

561665303 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 561665303 - 2⁸ = 561665047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561665333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280832651 + 280832652.

It is an arithmetic number, because the mean of its divisors is an integer number (280832652).

Almost surely, 2^561665303 is an apocalyptic number.

561665303 is a deficient number, since it is larger than the sum of its proper divisors (1).

561665303 is an equidigital number, since it uses as much as digits as its factorization.

561665303 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48600, while the sum is 35.

The square root of 561665303 is about 23699.4789605173. The cubic root of 561665303 is about 825.0732976811.

The spelling of 561665303 in words is "five hundred sixty-one million, six hundred sixty-five thousand, three hundred three".