866443616511563 has 2 divisors, whose sum is σ = 866443616511564. Its totient is φ = 866443616511562.

The previous prime is 866443616511533. The next prime is 866443616511569. The reversal of 866443616511563 is 365115616344668.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 866443616511563 - 2³² = 866439321544267 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 866443616511563.

It is not a weakly prime, because it can be changed into another prime (866443616511569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433221808255781 + 433221808255782.

It is an arithmetic number, because the mean of its divisors is an integer number (433221808255782).

Almost surely, 2^{866443616511563} is an apocalyptic number.

866443616511563 is a deficient number, since it is larger than the sum of its proper divisors (1).

866443616511563 is an equidigital number, since it uses as much as digits as its factorization.

866443616511563 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 223948800, while the sum is 65.

The spelling of 866443616511563 in words is "eight hundred sixty-six trillion, four hundred forty-three billion, six hundred sixteen million, five hundred eleven thousand, five hundred sixty-three".