18518516667 has 12 divisors (see below), whose sum is σ = 30570249840. Its totient is φ = 10582009488.

The previous prime is 18518516659. The next prime is 18518516711. The reversal of 18518516667 is 76661581581.

It is a happy number.

It is not a de Polignac number, because 18518516667 - 2³ = 18518516659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18518516647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 146972292 + ... + 146972417.

It is an arithmetic number, because the mean of its divisors is an integer number (2547520820).

Almost surely, 2^18518516667 is an apocalyptic number.

18518516667 is a deficient number, since it is larger than the sum of its proper divisors (12051733173).

18518516667 is a wasteful number, since it uses less digits than its factorization.

18518516667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293944722 (or 293944719 counting only the distinct ones).

The product of its digits is 2419200, while the sum is 54.

The spelling of 18518516667 in words is "eighteen billion, five hundred eighteen million, five hundred sixteen thousand, six hundred sixty-seven".