18538909465 has 8 divisors (see below), whose sum is σ = 22514724288. Its totient is φ = 14652438960.

The previous prime is 18538909409. The next prime is 18538909511. The reversal of 18538909465 is 56490983581.

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

It is not a de Polignac number, because 18538909465 - 2⁹ = 18538908953 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22335621 + ... + 22336450.

It is an arithmetic number, because the mean of its divisors is an integer number (2814340536).

Almost surely, 2^18538909465 is an apocalyptic number.

It is an amenable number.

18538909465 is a deficient number, since it is larger than the sum of its proper divisors (3975814823).

18538909465 is an equidigital number, since it uses as much as digits as its factorization.

18538909465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44672159.

The product of its (nonzero) digits is 9331200, while the sum is 58.

The spelling of 18538909465 in words is "eighteen billion, five hundred thirty-eight million, nine hundred nine thousand, four hundred sixty-five".