18564806105 has 4 divisors (see below), whose sum is σ = 22277767332. Its totient is φ = 14851844880.

The previous prime is 18564806077. The next prime is 18564806119. The reversal of 18564806105 is 50160846581.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5018872336 + 13545933769 = 70844^2 + 116387^2 .

It is not a de Polignac number, because 18564806105 - 2¹⁴ = 18564789721 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1856480606 + ... + 1856480615.

It is an arithmetic number, because the mean of its divisors is an integer number (5569441833).

Almost surely, 2^18564806105 is an apocalyptic number.

It is an amenable number.

18564806105 is a deficient number, since it is larger than the sum of its proper divisors (3712961227).

18564806105 is an equidigital number, since it uses as much as digits as its factorization.

18564806105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3712961226.

The product of its (nonzero) digits is 230400, while the sum is 44.

The spelling of 18564806105 in words is "eighteen billion, five hundred sixty-four million, eight hundred six thousand, one hundred five".