18378726912 has 480 divisors, whose sum is σ = 66937590720. Its totient is φ = 4724490240.

The previous prime is 18378726907. The next prime is 18378726941. The reversal of 18378726912 is 21962787381.

It is a happy number.

18378726912 is a `hidden beast` number, since 1 + 8 + 378 + 7 + 269 + 1 + 2 = 666.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 17191914 + ... + 17192982.

It is an arithmetic number, because the mean of its divisors is an integer number (139453314).

Almost surely, 2^18378726912 is an apocalyptic number.

18378726912 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18378726912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33468795360).

18378726912 is an abundant number, since it is smaller than the sum of its proper divisors (48558863808).

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

18378726912 is a wasteful number, since it uses less digits than its factorization.

18378726912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1154 (or 1135 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 54.

The spelling of 18378726912 in words is "eighteen billion, three hundred seventy-eight million, seven hundred twenty-six thousand, nine hundred twelve".