It is a congruent number.
It is an unprimeable number.
Almost surely, 211999539552 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 11999539552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16017910272).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
11999539552 is a wasteful number, since it uses less digits than its factorization.
11999539552 is an evil number, because the sum of its binary digits is even.
The spelling of 11999539552 in words is "eleven billion, nine hundred ninety-nine million, five hundred thirty-nine thousand, five hundred fifty-two".