845564465569 has 2 divisors, whose sum is σ = 845564465570. Its totient is φ = 845564465568.

The previous prime is 845564465513. The next prime is 845564465579. The reversal of 845564465569 is 965564465548.

845564465569 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 732222490000 + 113341975569 = 855700^2 + 336663^2 .

It is a cyclic number.

It is not a de Polignac number, because 845564465569 - 2²⁹ = 845027594657 is a prime.

It is a super-2 number, since 2×845564465569² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (845564465579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 422782232784 + 422782232785.

It is an arithmetic number, because the mean of its divisors is an integer number (422782232785).

Almost surely, 2^845564465569 is an apocalyptic number.

It is an amenable number.

845564465569 is a deficient number, since it is larger than the sum of its proper divisors (1).

845564465569 is an equidigital number, since it uses as much as digits as its factorization.

845564465569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 622080000, while the sum is 67.

The spelling of 845564465569 in words is "eight hundred forty-five billion, five hundred sixty-four million, four hundred sixty-five thousand, five hundred sixty-nine".