18318020449 has 8 divisors (see below), whose sum is σ = 18376680672. Its totient is φ = 18259425600.

The previous prime is 18318020447. The next prime is 18318020453. The reversal of 18318020449 is 94402081381.

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 18318020449 - 2¹ = 18318020447 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18318020447) 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, 579282 + ... + 610084.

It is an arithmetic number, because the mean of its divisors is an integer number (2297085084).

Almost surely, 2^18318020449 is an apocalyptic number.

It is an amenable number.

18318020449 is a deficient number, since it is larger than the sum of its proper divisors (58660223).

18318020449 is a wasteful number, since it uses less digits than its factorization.

18318020449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32687.

The product of its (nonzero) digits is 55296, while the sum is 40.

The spelling of 18318020449 in words is "eighteen billion, three hundred eighteen million, twenty thousand, four hundred forty-nine".