18534814509 has 4 divisors (see below), whose sum is σ = 24713086016. Its totient is φ = 12356543004.

The previous prime is 18534814489. The next prime is 18534814561. The reversal of 18534814509 is 90541843581.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 18534814509 - 2⁷ = 18534814381 is a prime.

It is a super-2 number, since 2×18534814509² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18534814589) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3089135749 + ... + 3089135754.

It is an arithmetic number, because the mean of its divisors is an integer number (6178271504).

Almost surely, 2^18534814509 is an apocalyptic number.

It is an amenable number.

18534814509 is a deficient number, since it is larger than the sum of its proper divisors (6178271507).

18534814509 is an equidigital number, since it uses as much as digits as its factorization.

18534814509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6178271506.

The product of its (nonzero) digits is 691200, while the sum is 48.

The spelling of 18534814509 in words is "eighteen billion, five hundred thirty-four million, eight hundred fourteen thousand, five hundred nine".