566561555663 has 2 divisors, whose sum is σ = 566561555664. Its totient is φ = 566561555662.

The previous prime is 566561555641. The next prime is 566561555687. The reversal of 566561555663 is 366555165665.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 566561555663 - 2²⁰ = 566560507087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (566561552663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 283280777831 + 283280777832.

It is an arithmetic number, because the mean of its divisors is an integer number (283280777832).

Almost surely, 2^566561555663 is an apocalyptic number.

566561555663 is a deficient number, since it is larger than the sum of its proper divisors (1).

566561555663 is an equidigital number, since it uses as much as digits as its factorization.

566561555663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72900000, while the sum is 59.

The spelling of 566561555663 in words is "five hundred sixty-six billion, five hundred sixty-one million, five hundred fifty-five thousand, six hundred sixty-three".