999158612088 has 128 divisors (see below), whose sum is σ = 3077128857600. Its totient is φ = 263274817536.

The previous prime is 999158612063. The next prime is 999158612093. The reversal of 999158612088 is 880216851999.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2201568 + ... + 2616336.

It is an arithmetic number, because the mean of its divisors is an integer number (24040069200).

Almost surely, 2^999158612088 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 999158612088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1538564428800).

999158612088 is an abundant number, since it is smaller than the sum of its proper divisors (2077970245512).

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

999158612088 is a wasteful number, since it uses less digits than its factorization.

999158612088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415901 (or 415897 counting only the distinct ones).

The product of its (nonzero) digits is 22394880, while the sum is 66.

The spelling of 999158612088 in words is "nine hundred ninety-nine billion, one hundred fifty-eight million, six hundred twelve thousand, eighty-eight".