18512259223 has 4 divisors (see below), whose sum is σ = 18606230280. Its totient is φ = 18418288168.

The previous prime is 18512259221. The next prime is 18512259307. The reversal of 18512259223 is 32295221581.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32295221581 = 7 ⋅4613603083.

It is a cyclic number.

It is not a de Polignac number, because 18512259223 - 2¹ = 18512259221 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 (18512259221) 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, 46985233 + ... + 46985626.

It is an arithmetic number, because the mean of its divisors is an integer number (4651557570).

Almost surely, 2^18512259223 is an apocalyptic number.

18512259223 is a deficient number, since it is larger than the sum of its proper divisors (93971057).

18512259223 is an equidigital number, since it uses as much as digits as its factorization.

18512259223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93971056.

The product of its digits is 86400, while the sum is 40.

The spelling of 18512259223 in words is "eighteen billion, five hundred twelve million, two hundred fifty-nine thousand, two hundred twenty-three".