18209639995 has 16 divisors (see below), whose sum is σ = 23019459840. Its totient is φ = 13790304864.

The previous prime is 18209639993. The next prime is 18209640019. The reversal of 18209639995 is 59993690281.

It is a cyclic number.

It is not a de Polignac number, because 18209639995 - 2¹ = 18209639993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18209639993) 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 15 ways as a sum of consecutive naturals, for example, 50232 + ... + 197338.

It is an arithmetic number, because the mean of its divisors is an integer number (1438716240).

Almost surely, 2^18209639995 is an apocalyptic number.

18209639995 is a deficient number, since it is larger than the sum of its proper divisors (4809819845).

18209639995 is a wasteful number, since it uses less digits than its factorization.

18209639995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148434.

The product of its (nonzero) digits is 9447840, while the sum is 61.

The spelling of 18209639995 in words is "eighteen billion, two hundred nine million, six hundred thirty-nine thousand, nine hundred ninety-five".