18138223671 has 4 divisors (see below), whose sum is σ = 24184298232. Its totient is φ = 12092149112.

The previous prime is 18138223651. The next prime is 18138223687. The reversal of 18138223671 is 17632283181.

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

It is a cyclic number.

It is not a de Polignac number, because 18138223671 - 2¹⁴ = 18138207287 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18138223651) 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, 3023037276 + ... + 3023037281.

It is an arithmetic number, because the mean of its divisors is an integer number (6046074558).

Almost surely, 2^18138223671 is an apocalyptic number.

18138223671 is a deficient number, since it is larger than the sum of its proper divisors (6046074561).

18138223671 is an equidigital number, since it uses as much as digits as its factorization.

18138223671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6046074560.

The product of its digits is 96768, while the sum is 42.

The spelling of 18138223671 in words is "eighteen billion, one hundred thirty-eight million, two hundred twenty-three thousand, six hundred seventy-one".