999999997764120 is a `hidden beast` number, since 9 + 9 + 9 + 9 + 9 + 99 + 97 + 7 + 6 + 412 + 0 = 666.
It is a congruent number.
It is an unprimeable number.
Almost surely, 2999999997764120 is an apocalyptic number.
999999997764120 is a gapful number since it is divisible by the number (90) 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 999999997764120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1638787404384000).
999999997764120 is an abundant number, since it is smaller than the sum of its proper divisors (2277574811003880).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
999999997764120 is a wasteful number, since it uses less digits than its factorization.
999999997764120 is an odious number, because the sum of its binary digits is odd.
The spelling of 999999997764120 in words is "nine hundred ninety-nine trillion, nine hundred ninety-nine billion, nine hundred ninety-seven million, seven hundred sixty-four thousand, one hundred twenty".