18694159223 has 16 divisors (see below), whose sum is σ = 20173772640. Its totient is φ = 17264793600.

The previous prime is 18694159201. The next prime is 18694159271. The reversal of 18694159223 is 32295149681.

It is a cyclic number.

It is not a de Polignac number, because 18694159223 - 2¹⁰ = 18694158199 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 (18694159273) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1067111 + ... + 1084487.

It is an arithmetic number, because the mean of its divisors is an integer number (1260860790).

Almost surely, 2^18694159223 is an apocalyptic number.

18694159223 is a deficient number, since it is larger than the sum of its proper divisors (1479613417).

18694159223 is a wasteful number, since it uses less digits than its factorization.

18694159223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18818.

The product of its digits is 933120, while the sum is 50.

The spelling of 18694159223 in words is "eighteen billion, six hundred ninety-four million, one hundred fifty-nine thousand, two hundred twenty-three".