18378322641 has 108 divisors (see below), whose sum is σ = 33097055472. Its totient is φ = 9794983968.

The previous prime is 18378322637. The next prime is 18378322643. The reversal of 18378322641 is 14622387381.

18378322641 is a `hidden beast` number, since 18 + 378 + 3 + 2 + 264 + 1 = 666.

It is not a de Polignac number, because 18378322641 - 2² = 18378322637 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18378322643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 10665606 + ... + 10667328.

Almost surely, 2^18378322641 is an apocalyptic number.

It is an amenable number.

18378322641 is a deficient number, since it is larger than the sum of its proper divisors (14718732831).

18378322641 is a wasteful number, since it uses less digits than its factorization.

18378322641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1848 (or 1819 counting only the distinct ones).

The product of its digits is 387072, while the sum is 45.

The spelling of 18378322641 in words is "eighteen billion, three hundred seventy-eight million, three hundred twenty-two thousand, six hundred forty-one".