561287688893 has 2 divisors, whose sum is σ = 561287688894. Its totient is φ = 561287688892.

The previous prime is 561287688887. The next prime is 561287688919. The reversal of 561287688893 is 398886782165.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 556690577689 + 4597111204 = 746117^2 + 67802^2 .

It is a cyclic number.

It is not a de Polignac number, because 561287688893 - 2¹⁰ = 561287687869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561287688883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280643844446 + 280643844447.

It is an arithmetic number, because the mean of its divisors is an integer number (280643844447).

Almost surely, 2^561287688893 is an apocalyptic number.

It is an amenable number.

561287688893 is a deficient number, since it is larger than the sum of its proper divisors (1).

561287688893 is an equidigital number, since it uses as much as digits as its factorization.

561287688893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 278691840, while the sum is 71.

The spelling of 561287688893 in words is "five hundred sixty-one billion, two hundred eighty-seven million, six hundred eighty-eight thousand, eight hundred ninety-three".