566561557511 has 2 divisors, whose sum is σ = 566561557512. Its totient is φ = 566561557510.

The previous prime is 566561557487. The next prime is 566561557561. The reversal of 566561557511 is 115755165665.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 566561557511 - 2¹⁰ = 566561556487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (566561557561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 283280778755 + 283280778756.

It is an arithmetic number, because the mean of its divisors is an integer number (283280778756).

Almost surely, 2^566561557511 is an apocalyptic number.

566561557511 is a deficient number, since it is larger than the sum of its proper divisors (1).

566561557511 is an equidigital number, since it uses as much as digits as its factorization.

566561557511 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4725000, while the sum is 53.

The spelling of 566561557511 in words is "five hundred sixty-six billion, five hundred sixty-one million, five hundred fifty-seven thousand, five hundred eleven".