18378781068 has 12 divisors (see below), whose sum is σ = 42883822520. Its totient is φ = 6126260352.

The previous prime is 18378781067. The next prime is 18378781093. The reversal of 18378781068 is 86018787381.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 18378780999 and 18378781017.

It is not an unprimeable number, because it can be changed into a prime (18378781067) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 765782533 + ... + 765782556.

Almost surely, 2^18378781068 is an apocalyptic number.

It is an amenable number.

18378781068 is an abundant number, since it is smaller than the sum of its proper divisors (24505041452).

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

18378781068 is a wasteful number, since it uses less digits than its factorization.

18378781068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1531565096 (or 1531565094 counting only the distinct ones).

The product of its (nonzero) digits is 3612672, while the sum is 57.

The spelling of 18378781068 in words is "eighteen billion, three hundred seventy-eight million, seven hundred eighty-one thousand, sixty-eight".