999129220992 has 192 divisors, whose sum is σ = 3287781675360. Its totient is φ = 285295656960.

The previous prime is 999129220981. The next prime is 999129221021. The reversal of 999129220992 is 299022921999.

It is a tau number, because it is divible by the number of its divisors (192).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13842148 + ... + 13914140.

Almost surely, 2^999129220992 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 999129220992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1643890837680).

999129220992 is an abundant number, since it is smaller than the sum of its proper divisors (2288652454368).

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

999129220992 is a wasteful number, since it uses less digits than its factorization.

999129220992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73741 (or 73726 counting only the distinct ones).

The product of its (nonzero) digits is 8503056, while the sum is 63.

The spelling of 999129220992 in words is "nine hundred ninety-nine billion, one hundred twenty-nine million, two hundred twenty thousand, nine hundred ninety-two".