18321793489 has 8 divisors (see below), whose sum is σ = 18482679072. Its totient is φ = 18161226720.

The previous prime is 18321793487. The next prime is 18321793513. The reversal of 18321793489 is 98439712381.

It is a happy number.

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 18321793489 - 2¹ = 18321793487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18321793487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36477 + ... + 194869.

It is an arithmetic number, because the mean of its divisors is an integer number (2310334884).

Almost surely, 2^18321793489 is an apocalyptic number.

It is an amenable number.

18321793489 is a deficient number, since it is larger than the sum of its proper divisors (160885583).

18321793489 is a wasteful number, since it uses less digits than its factorization.

18321793489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159407.

The product of its digits is 2612736, while the sum is 55.

The spelling of 18321793489 in words is "eighteen billion, three hundred twenty-one million, seven hundred ninety-three thousand, four hundred eighty-nine".