561660517 has 16 divisors (see below), whose sum is σ = 628891200. Its totient is φ = 497174400.

The previous prime is 561660503. The next prime is 561660523. The reversal of 561660517 is 715066165.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-561660517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561660317) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 329734 + ... + 331432.

It is an arithmetic number, because the mean of its divisors is an integer number (39305700).

Almost surely, 2^561660517 is an apocalyptic number.

It is an amenable number.

561660517 is a deficient number, since it is larger than the sum of its proper divisors (67230683).

561660517 is a wasteful number, since it uses less digits than its factorization.

561660517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2484.

The product of its (nonzero) digits is 37800, while the sum is 37.

The square root of 561660517 is about 23699.3779876182. The cubic root of 561660517 is about 825.0709541668.

The spelling of 561660517 in words is "five hundred sixty-one million, six hundred sixty thousand, five hundred seventeen".