126531444636 is a `hidden beast` number, since 1 + 2 + 6 + 5 + 3 + 1 + 4 + 4 + 4 + 636 = 666.
It is a congruent number.
It is an unprimeable number.
Almost surely, 2126531444636 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 126531444636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (163927108800).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
126531444636 is a wasteful number, since it uses less digits than its factorization.
126531444636 is an evil number, because the sum of its binary digits is even.
The spelling of 126531444636 in words is "one hundred twenty-six billion, five hundred thirty-one million, four hundred forty-four thousand, six hundred thirty-six".