18378555852385 has 16 divisors (see below), whose sum is σ = 22228567320960. Its totient is φ = 14586961541760.

The previous prime is 18378555852379. The next prime is 18378555852403. The reversal of 18378555852385 is 58325855587381.

It is not a de Polignac number, because 18378555852385 - 2⁴³ = 9582462830177 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19352061 + ... + 20279530.

It is an arithmetic number, because the mean of its divisors is an integer number (1389285457560).

Almost surely, 2^{18378555852385} is an apocalyptic number.

It is an amenable number.

18378555852385 is a deficient number, since it is larger than the sum of its proper divisors (3850011468575).

18378555852385 is a wasteful number, since it uses less digits than its factorization.

18378555852385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39632328.

The product of its digits is 1612800000, while the sum is 73.

The spelling of 18378555852385 in words is "eighteen trillion, three hundred seventy-eight billion, five hundred fifty-five million, eight hundred fifty-two thousand, three hundred eighty-five".