561216094561 has 4 divisors (see below), whose sum is σ = 561247045632. Its totient is φ = 561185143492.

The previous prime is 561216094559. The next prime is 561216094603. The reversal of 561216094561 is 165490612165.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 561216094561 - 2¹ = 561216094559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561216094511) 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, 15448321 + ... + 15484606.

It is an arithmetic number, because the mean of its divisors is an integer number (140311761408).

Almost surely, 2^561216094561 is an apocalyptic number.

It is an amenable number.

561216094561 is a deficient number, since it is larger than the sum of its proper divisors (30951071).

561216094561 is a wasteful number, since it uses less digits than its factorization.

561216094561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30951070.

The product of its (nonzero) digits is 388800, while the sum is 46.

The spelling of 561216094561 in words is "five hundred sixty-one billion, two hundred sixteen million, ninety-four thousand, five hundred sixty-one".