565045665821 has 16 divisors (see below), whose sum is σ = 696543015168. Its totient is φ = 446360544000.

The previous prime is 565045665791. The next prime is 565045665841. The reversal of 565045665821 is 128566540565.

It is a happy number.

It is not a de Polignac number, because 565045665821 - 2²⁶ = 564978556957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (565045665841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4862780 + ... + 4977621.

It is an arithmetic number, because the mean of its divisors is an integer number (43533938448).

Almost surely, 2^565045665821 is an apocalyptic number.

It is an amenable number.

565045665821 is a deficient number, since it is larger than the sum of its proper divisors (131497349347).

565045665821 is a wasteful number, since it uses less digits than its factorization.

565045665821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9841052.

The product of its (nonzero) digits is 8640000, while the sum is 53.

The spelling of 565045665821 in words is "five hundred sixty-five billion, forty-five million, six hundred sixty-five thousand, eight hundred twenty-one".