18378874333285 has 4 divisors (see below), whose sum is σ = 22054649199948. Its totient is φ = 14703099466624.

The previous prime is 18378874333243. The next prime is 18378874333307. The reversal of 18378874333285 is 58233347887381.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8711245996324 + 9667628336961 = 2951482^2 + 3109281^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18378874333285 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1837887433324 + ... + 1837887433333.

It is an arithmetic number, because the mean of its divisors is an integer number (5513662299987).

Almost surely, 2^{18378874333285} is an apocalyptic number.

It is an amenable number.

18378874333285 is a deficient number, since it is larger than the sum of its proper divisors (3675774866663).

18378874333285 is an equidigital number, since it uses as much as digits as its factorization.

18378874333285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3675774866662.

The product of its digits is 650280960, while the sum is 70.

The spelling of 18378874333285 in words is "eighteen trillion, three hundred seventy-eight billion, eight hundred seventy-four million, three hundred thirty-three thousand, two hundred eighty-five".