It is a happy number.
It is a congruent number.
It is an unprimeable number.
Almost surely, 2125686619520 is an apocalyptic number.
125686619520 is a gapful number since it is divisible by the number (10) 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 125686619520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (270813818880).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
125686619520 is a wasteful number, since it uses less digits than its factorization.
125686619520 is an odious number, because the sum of its binary digits is odd.
The spelling of 125686619520 in words is "one hundred twenty-five billion, six hundred eighty-six million, six hundred nineteen thousand, five hundred twenty".