999499391968 has 96 divisors (see below), whose sum is σ = 2455272933120. Its totient is φ = 389104834560.

The previous prime is 999499391941. The next prime is 999499392077. The reversal of 999499391968 is 869193994999.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2941080 + ... + 3263272.

It is an arithmetic number, because the mean of its divisors is an integer number (25575759720).

Almost surely, 2^999499391968 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 999499391968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1227636466560).

999499391968 is an abundant number, since it is smaller than the sum of its proper divisors (1455773541152).

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

999499391968 is a wasteful number, since it uses less digits than its factorization.

999499391968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323480 (or 323472 counting only the distinct ones).

The product of its digits is 2754990144, while the sum is 85.

The spelling of 999499391968 in words is "nine hundred ninety-nine billion, four hundred ninety-nine million, three hundred ninety-one thousand, nine hundred sixty-eight".