It is a congruent number.
It is an unprimeable number.
Almost surely, 2120783835454520 is an apocalyptic number.
120783835454520 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 pseudoperfect number, because it is the sum of a subset of its proper divisors.
120783835454520 is a wasteful number, since it uses less digits than its factorization.
120783835454520 is an evil number, because the sum of its binary digits is even.
The spelling of 120783835454520 in words is "one hundred twenty trillion, seven hundred eighty-three billion, eight hundred thirty-five million, four hundred fifty-four thousand, five hundred twenty".