18385816761139 has 4 divisors (see below), whose sum is σ = 18397520019720. Its totient is φ = 18374113502560.

The previous prime is 18385816761127. The next prime is 18385816761157. The reversal of 18385816761139 is 93116761858381.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18385816761139 - 2⁹ = 18385816760627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18385816767139) 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, 5851626934 + ... + 5851630075.

It is an arithmetic number, because the mean of its divisors is an integer number (4599380004930).

Almost surely, 2^{18385816761139} is an apocalyptic number.

18385816761139 is a deficient number, since it is larger than the sum of its proper divisors (11703258581).

18385816761139 is a wasteful number, since it uses less digits than its factorization.

18385816761139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11703258580.

The product of its digits is 52254720, while the sum is 67.

The spelling of 18385816761139 in words is "eighteen trillion, three hundred eighty-five billion, eight hundred sixteen million, seven hundred sixty-one thousand, one hundred thirty-nine".