561668816711 has 4 divisors (see below), whose sum is σ = 591230333400. Its totient is φ = 532107300024.

The previous prime is 561668816677. The next prime is 561668816773. The reversal of 561668816711 is 117618866165.

561668816711 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 117618866165 = 5 ⋅23523773233.

It is a cyclic number.

It is not a de Polignac number, because 561668816711 - 2⁶ = 561668816647 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 (561668810711) 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, 14780758316 + ... + 14780758353.

It is an arithmetic number, because the mean of its divisors is an integer number (147807583350).

Almost surely, 2^561668816711 is an apocalyptic number.

561668816711 is a deficient number, since it is larger than the sum of its proper divisors (29561516689).

561668816711 is a wasteful number, since it uses less digits than its factorization.

561668816711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29561516688.

The product of its digits is 2903040, while the sum is 56.

The spelling of 561668816711 in words is "five hundred sixty-one billion, six hundred sixty-eight million, eight hundred sixteen thousand, seven hundred eleven".