18378353729 has 4 divisors (see below), whose sum is σ = 18652657584. Its totient is φ = 18104049876.

The previous prime is 18378353717. The next prime is 18378353737. The reversal of 18378353729 is 92735387381.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18378353729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18378353779) 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, 137151827 + ... + 137151960.

It is an arithmetic number, because the mean of its divisors is an integer number (4663164396).

Almost surely, 2^18378353729 is an apocalyptic number.

It is an amenable number.

18378353729 is a deficient number, since it is larger than the sum of its proper divisors (274303855).

18378353729 is an equidigital number, since it uses as much as digits as its factorization.

18378353729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274303854.

The product of its digits is 7620480, while the sum is 56.

The spelling of 18378353729 in words is "eighteen billion, three hundred seventy-eight million, three hundred fifty-three thousand, seven hundred twenty-nine".