18810421823 has 8 divisors (see below), whose sum is σ = 19321080240. Its totient is φ = 18299882880.

The previous prime is 18810421789. The next prime is 18810421829. The reversal of 18810421823 is 32812401881.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18810421823 - 2¹⁶ = 18810356287 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 (18810421829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 355988 + ... + 405398.

It is an arithmetic number, because the mean of its divisors is an integer number (2415135030).

Almost surely, 2^18810421823 is an apocalyptic number.

18810421823 is a deficient number, since it is larger than the sum of its proper divisors (510658417).

18810421823 is a wasteful number, since it uses less digits than its factorization.

18810421823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59737.

The product of its (nonzero) digits is 24576, while the sum is 38.

The spelling of 18810421823 in words is "eighteen billion, eight hundred ten million, four hundred twenty-one thousand, eight hundred twenty-three".