18211865327 has 4 divisors (see below), whose sum is σ = 18213290760. Its totient is φ = 18210439896.

The previous prime is 18211865299. The next prime is 18211865369. The reversal of 18211865327 is 72356811281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72356811281 = 47 ⋅1539506623.

It is a cyclic number.

It is not a de Polignac number, because 18211865327 - 2⁶ = 18211865263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18211865377) 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 3 ways as a sum of consecutive naturals, for example, 693377 + ... + 719162.

It is an arithmetic number, because the mean of its divisors is an integer number (4553322690).

Almost surely, 2^18211865327 is an apocalyptic number.

18211865327 is a deficient number, since it is larger than the sum of its proper divisors (1425433).

18211865327 is a wasteful number, since it uses less digits than its factorization.

18211865327 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1425432.

The product of its digits is 161280, while the sum is 44.

The spelling of 18211865327 in words is "eighteen billion, two hundred eleven million, eight hundred sixty-five thousand, three hundred twenty-seven".