18002689321 has 4 divisors (see below), whose sum is σ = 18385725312. Its totient is φ = 17619653332.

The previous prime is 18002689307. The next prime is 18002689337. The reversal of 18002689321 is 12398620081.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18002689321 - 2¹¹ = 18002687273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18002689301) 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, 191517925 + ... + 191518018.

It is an arithmetic number, because the mean of its divisors is an integer number (4596431328).

Almost surely, 2^18002689321 is an apocalyptic number.

It is an amenable number.

18002689321 is a deficient number, since it is larger than the sum of its proper divisors (383035991).

18002689321 is an equidigital number, since it uses as much as digits as its factorization.

18002689321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383035990.

The product of its (nonzero) digits is 41472, while the sum is 40.

The spelling of 18002689321 in words is "eighteen billion, two million, six hundred eighty-nine thousand, three hundred twenty-one".