18500935109 has 4 divisors (see below), whose sum is σ = 19305323616. Its totient is φ = 17696546604.

The previous prime is 18500935097. The next prime is 18500935157. The reversal of 18500935109 is 90153900581.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18500935109 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 (18500935169) 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, 402194219 + ... + 402194264.

It is an arithmetic number, because the mean of its divisors is an integer number (4826330904).

Almost surely, 2^18500935109 is an apocalyptic number.

It is an amenable number.

18500935109 is a deficient number, since it is larger than the sum of its proper divisors (804388507).

18500935109 is an equidigital number, since it uses as much as digits as its factorization.

18500935109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 804388506.

The product of its (nonzero) digits is 48600, while the sum is 41.

The spelling of 18500935109 in words is "eighteen billion, five hundred million, nine hundred thirty-five thousand, one hundred nine".