18017946489 has 4 divisors (see below), whose sum is σ = 24023928656. Its totient is φ = 12011964324.

The previous prime is 18017946439. The next prime is 18017946497. The reversal of 18017946489 is 98464971081.

It is a happy number.

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 not a de Polignac number, because 18017946489 - 2⁷ = 18017946361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18017946439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3002991079 + ... + 3002991084.

It is an arithmetic number, because the mean of its divisors is an integer number (6005982164).

Almost surely, 2^18017946489 is an apocalyptic number.

It is an amenable number.

18017946489 is a deficient number, since it is larger than the sum of its proper divisors (6005982167).

18017946489 is an equidigital number, since it uses as much as digits as its factorization.

18017946489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6005982166.

The product of its (nonzero) digits is 3483648, while the sum is 57.

The spelling of 18017946489 in words is "eighteen billion, seventeen million, nine hundred forty-six thousand, four hundred eighty-nine".