18438971117076 is a `hidden beast` number, since 1 + 8 + 4 + 389 + 7 + 11 + 170 + 76 = 666.
It is a congruent number.
It is an unprimeable number.
Almost surely, 218438971117076 is an apocalyptic number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 18438971117076, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26304430501440).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
18438971117076 is a wasteful number, since it uses less digits than its factorization.
18438971117076 is an odious number, because the sum of its binary digits is odd.
The spelling of 18438971117076 in words is "eighteen trillion, four hundred thirty-eight billion, nine hundred seventy-one million, one hundred seventeen thousand, seventy-six".