561665343 has 16 divisors (see below), whose sum is σ = 758130912. Its totient is φ = 369840000.

The previous prime is 561665333. The next prime is 561665371. The reversal of 561665343 is 343566165.

It is a happy number.

It is not a de Polignac number, because 561665343 - 2⁵ = 561665311 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561665303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 137673 + ... + 141693.

It is an arithmetic number, because the mean of its divisors is an integer number (47383182).

Almost surely, 2^561665343 is an apocalyptic number.

561665343 is a deficient number, since it is larger than the sum of its proper divisors (196465569).

561665343 is a wasteful number, since it uses less digits than its factorization.

561665343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4586.

The product of its digits is 194400, while the sum is 39.

The square root of 561665343 is about 23699.4798044176. The cubic root of 561665343 is about 825.0733172674.

The spelling of 561665343 in words is "five hundred sixty-one million, six hundred sixty-five thousand, three hundred forty-three".