18520127109 has 12 divisors (see below), whose sum is σ = 29183230752. Its totient is φ = 11224319400.

The previous prime is 18520127057. The next prime is 18520127113. The reversal of 18520127109 is 90172102581.

It is a happy number.

18520127109 is a `hidden beast` number, since 1 + 8 + 520 + 1 + 27 + 109 = 666.

It is not a de Polignac number, because 18520127109 - 2¹¹ = 18520125061 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18520127309) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 93535897 + ... + 93536094.

It is an arithmetic number, because the mean of its divisors is an integer number (2431935896).

Almost surely, 2^18520127109 is an apocalyptic number.

It is an amenable number.

18520127109 is a deficient number, since it is larger than the sum of its proper divisors (10663103643).

18520127109 is a wasteful number, since it uses less digits than its factorization.

18520127109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187072008 (or 187072005 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 36.

The spelling of 18520127109 in words is "eighteen billion, five hundred twenty million, one hundred twenty-seven thousand, one hundred nine".