990109910912 has 64 divisors (see below), whose sum is σ = 1983382044000. Its totient is φ = 492322406400.

The previous prime is 990109910849. The next prime is 990109910921. The reversal of 990109910912 is 219019901099.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58093112 + ... + 58110152.

Almost surely, 2^990109910912 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 990109910912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (991691022000).

990109910912 is an abundant number, since it is smaller than the sum of its proper divisors (993272133088).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

990109910912 is a wasteful number, since it uses less digits than its factorization.

990109910912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19535 (or 19523 counting only the distinct ones).

The product of its (nonzero) digits is 118098, while the sum is 50.

The spelling of 990109910912 in words is "nine hundred ninety billion, one hundred nine million, nine hundred ten thousand, nine hundred twelve".