18136193509 has 8 divisors (see below), whose sum is σ = 20728081088. Its totient is φ = 15544556640.

The previous prime is 18136193489. The next prime is 18136193567. The reversal of 18136193509 is 90539163181.

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 18136193509 - 2⁵ = 18136193477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18136193599) 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, 133129 + ... + 232369.

It is an arithmetic number, because the mean of its divisors is an integer number (2591010136).

Almost surely, 2^18136193509 is an apocalyptic number.

It is an amenable number.

18136193509 is a deficient number, since it is larger than the sum of its proper divisors (2591887579).

18136193509 is an equidigital number, since it uses as much as digits as its factorization.

18136193509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125355.

The product of its (nonzero) digits is 174960, while the sum is 46.

The spelling of 18136193509 in words is "eighteen billion, one hundred thirty-six million, one hundred ninety-three thousand, five hundred nine".