18011009809 has 8 divisors (see below), whose sum is σ = 20239797312. Its totient is φ = 15902697360.

The previous prime is 18011009803. The next prime is 18011009869. The reversal of 18011009809 is 90890011081.

It is a happy number.

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 18011009809 - 2⁹ = 18011009297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18011009803) by changing a digit.

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, 30118447 + ... + 30119044.

It is an arithmetic number, because the mean of its divisors is an integer number (2529974664).

Almost surely, 2^18011009809 is an apocalyptic number.

It is an amenable number.

18011009809 is a deficient number, since it is larger than the sum of its proper divisors (2228787503).

18011009809 is a wasteful number, since it uses less digits than its factorization.

18011009809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60237527.

The product of its (nonzero) digits is 5184, while the sum is 37.

The spelling of 18011009809 in words is "eighteen billion, eleven million, nine thousand, eight hundred nine".