18013878738944 has 56 divisors (see below), whose sum is σ = 39300609489048. Its totient is φ = 8188126658560.

The previous prime is 18013878738907. The next prime is 18013878738959. The reversal of 18013878738944 is 44983787831081.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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, 99862607 + ... + 100042830.

Almost surely, 2^{18013878738944} is an apocalyptic number.

It is an amenable number.

18013878738944 is an abundant number, since it is smaller than the sum of its proper divisors (21286730750104).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18013878738944 is an equidigital number, since it uses as much as digits as its factorization.

18013878738944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199905474 (or 199905450 counting only the distinct ones).

The product of its (nonzero) digits is 260112384, while the sum is 71.

The spelling of 18013878738944 in words is "eighteen trillion, thirteen billion, eight hundred seventy-eight million, seven hundred thirty-eight thousand, nine hundred forty-four".