18566844359 has 6 divisors (see below), whose sum is σ = 21598165944. Its totient is φ = 15914437980.

The previous prime is 18566844347. The next prime is 18566844391. The reversal of 18566844359 is 95344866581.

It is not a de Polignac number, because 18566844359 - 2¹⁶ = 18566778823 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18566844298 and 18566844307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18566844059) 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 in 5 ways as a sum of consecutive naturals, for example, 189457547 + ... + 189457644.

It is an arithmetic number, because the mean of its divisors is an integer number (3599694324).

Almost surely, 2^18566844359 is an apocalyptic number.

18566844359 is a deficient number, since it is larger than the sum of its proper divisors (3031321585).

18566844359 is an equidigital number, since it uses as much as digits as its factorization.

18566844359 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378915205 (or 378915198 counting only the distinct ones).

The product of its digits is 24883200, while the sum is 59.

The spelling of 18566844359 in words is "eighteen billion, five hundred sixty-six million, eight hundred forty-four thousand, three hundred fifty-nine".