561287688191 has 4 divisors (see below), whose sum is σ = 561289455984. Its totient is φ = 561285920400.

The previous prime is 561287688083. The next prime is 561287688217. The reversal of 561287688191 is 191886782165.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 561287688191 - 2²⁶ = 561220579327 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 (561287682191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 261590 + ... + 1091331.

It is an arithmetic number, because the mean of its divisors is an integer number (140322363996).

Almost surely, 2^561287688191 is an apocalyptic number.

561287688191 is a deficient number, since it is larger than the sum of its proper divisors (1767793).

561287688191 is a wasteful number, since it uses less digits than its factorization.

561287688191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1767792.

The product of its digits is 11612160, while the sum is 62.

The spelling of 561287688191 in words is "five hundred sixty-one billion, two hundred eighty-seven million, six hundred eighty-eight thousand, one hundred ninety-one".