18387217223 has 4 divisors (see below), whose sum is σ = 18483485568. Its totient is φ = 18290948880.

The previous prime is 18387217213. The next prime is 18387217237. The reversal of 18387217223 is 32271278381.

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 18387217223 - 2⁴ = 18387217207 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 (18387217213) 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, 48133886 + ... + 48134267.

It is an arithmetic number, because the mean of its divisors is an integer number (4620871392).

Almost surely, 2^18387217223 is an apocalyptic number.

18387217223 is a deficient number, since it is larger than the sum of its proper divisors (96268345).

18387217223 is an equidigital number, since it uses as much as digits as its factorization.

18387217223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96268344.

The product of its digits is 225792, while the sum is 44.

The spelling of 18387217223 in words is "eighteen billion, three hundred eighty-seven million, two hundred seventeen thousand, two hundred twenty-three".