18043539607 has 4 divisors (see below), whose sum is σ = 18222188616. Its totient is φ = 17864890600.

The previous prime is 18043539599. The next prime is 18043539671. The reversal of 18043539607 is 70693534081.

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 18043539607 - 2³ = 18043539599 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 (18043539697) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 89324353 + ... + 89324554.

It is an arithmetic number, because the mean of its divisors is an integer number (4555547154).

Almost surely, 2^18043539607 is an apocalyptic number.

18043539607 is a deficient number, since it is larger than the sum of its proper divisors (178649009).

18043539607 is a wasteful number, since it uses less digits than its factorization.

18043539607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178649008.

The product of its (nonzero) digits is 544320, while the sum is 46.

The spelling of 18043539607 in words is "eighteen billion, forty-three million, five hundred thirty-nine thousand, six hundred seven".