18538342615 has 12 divisors (see below), whose sum is σ = 24088877064. Its totient is φ = 13689852384.

The previous prime is 18538342601. The next prime is 18538342633. The reversal of 18538342615 is 51624383581.

It is not a de Polignac number, because 18538342615 - 2⁵ = 18538342583 is a prime.

It is a super-2 number, since 2×18538342615² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10968589 + ... + 10970278.

It is an arithmetic number, because the mean of its divisors is an integer number (2007406422).

Almost surely, 2^18538342615 is an apocalyptic number.

18538342615 is a deficient number, since it is larger than the sum of its proper divisors (5550534449).

18538342615 is a wasteful number, since it uses less digits than its factorization.

18538342615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21938898 (or 21938885 counting only the distinct ones).

The product of its digits is 691200, while the sum is 46.

The spelling of 18538342615 in words is "eighteen billion, five hundred thirty-eight million, three hundred forty-two thousand, six hundred fifteen".