18639582223 has 4 divisors (see below), whose sum is σ = 18646914528. Its totient is φ = 18632249920.

The previous prime is 18639582211. The next prime is 18639582229. The reversal of 18639582223 is 32228593681.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18639582223 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18639582229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3662338 + ... + 3667423.

It is an arithmetic number, because the mean of its divisors is an integer number (4661728632).

Almost surely, 2^18639582223 is an apocalyptic number.

18639582223 is a deficient number, since it is larger than the sum of its proper divisors (7332305).

18639582223 is an equidigital number, since it uses as much as digits as its factorization.

18639582223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7332304.

The product of its digits is 1244160, while the sum is 49.

The spelling of 18639582223 in words is "eighteen billion, six hundred thirty-nine million, five hundred eighty-two thousand, two hundred twenty-three".