18138575585 has 16 divisors (see below), whose sum is σ = 23443460544. Its totient is φ = 13393017792.

The previous prime is 18138575573. The next prime is 18138575641. The reversal of 18138575585 is 58557583181.

It is a cyclic number.

It is not a de Polignac number, because 18138575585 - 2⁴ = 18138575569 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18138575585.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 921254 + ... + 940736.

It is an arithmetic number, because the mean of its divisors is an integer number (1465216284).

Almost surely, 2^18138575585 is an apocalyptic number.

It is an amenable number.

18138575585 is a deficient number, since it is larger than the sum of its proper divisors (5304884959).

18138575585 is a wasteful number, since it uses less digits than its factorization.

18138575585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33824.

The product of its digits is 6720000, while the sum is 56.

The spelling of 18138575585 in words is "eighteen billion, one hundred thirty-eight million, five hundred seventy-five thousand, five hundred eighty-five".