18202203823 has 4 divisors (see below), whose sum is σ = 18307419048. Its totient is φ = 18096988600.

The previous prime is 18202203791. The next prime is 18202203847. The reversal of 18202203823 is 32830220281.

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 18202203823 - 2⁵ = 18202203791 is a prime.

It is a Smith number, since the sum of its digits (31) 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 (18202203883) 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, 52607353 + ... + 52607698.

It is an arithmetic number, because the mean of its divisors is an integer number (4576854762).

Almost surely, 2^18202203823 is an apocalyptic number.

18202203823 is a deficient number, since it is larger than the sum of its proper divisors (105215225).

18202203823 is a wasteful number, since it uses less digits than its factorization.

18202203823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105215224.

The product of its (nonzero) digits is 9216, while the sum is 31.

The spelling of 18202203823 in words is "eighteen billion, two hundred two million, two hundred three thousand, eight hundred twenty-three".