561604235999 has 2 divisors, whose sum is σ = 561604236000. Its totient is φ = 561604235998.

The previous prime is 561604235963. The next prime is 561604236023. The reversal of 561604235999 is 999532406165.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 561604235999 - 2²⁰ = 561603187423 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561604235909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280802117999 + 280802118000.

It is an arithmetic number, because the mean of its divisors is an integer number (280802118000).

Almost surely, 2^561604235999 is an apocalyptic number.

561604235999 is a deficient number, since it is larger than the sum of its proper divisors (1).

561604235999 is an equidigital number, since it uses as much as digits as its factorization.

561604235999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15746400, while the sum is 59.

The spelling of 561604235999 in words is "five hundred sixty-one billion, six hundred four million, two hundred thirty-five thousand, nine hundred ninety-nine".