561786687173 has 2 divisors, whose sum is σ = 561786687174. Its totient is φ = 561786687172.

The previous prime is 561786687157. The next prime is 561786687179. The reversal of 561786687173 is 371786687165.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 383565932929 + 178220754244 = 619327^2 + 422162^2 .

It is a cyclic number.

It is not a de Polignac number, because 561786687173 - 2⁴ = 561786687157 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561786687179) 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 as a sum of consecutive naturals, namely, 280893343586 + 280893343587.

It is an arithmetic number, because the mean of its divisors is an integer number (280893343587).

Almost surely, 2^561786687173 is an apocalyptic number.

It is an amenable number.

561786687173 is a deficient number, since it is larger than the sum of its proper divisors (1).

561786687173 is an equidigital number, since it uses as much as digits as its factorization.

561786687173 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 71124480, while the sum is 65.

The spelling of 561786687173 in words is "five hundred sixty-one billion, seven hundred eighty-six million, six hundred eighty-seven thousand, one hundred seventy-three".