999599569920 has 1056 divisors, whose sum is σ = 4191883937280. Its totient is φ = 215150100480.

The previous prime is 999599569907. The next prime is 999599569933. The reversal of 999599569920 is 29965995999.

It is an interprime number because it is at equal distance from previous prime (999599569907) and next prime (999599569933).

It is a self number, because there is not a number n which added to its sum of digits gives 999599569920.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1293142654 + ... + 1293143426.

Almost surely, 2^999599569920 is an apocalyptic number.

999599569920 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 999599569920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2095941968640).

999599569920 is an abundant number, since it is smaller than the sum of its proper divisors (3192284367360).

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

999599569920 is a wasteful number, since it uses less digits than its factorization.

999599569920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1041 (or 1020 counting only the distinct ones).

The product of its (nonzero) digits is 1434890700, while the sum is 81.

The spelling of 999599569920 in words is "nine hundred ninety-nine billion, five hundred ninety-nine million, five hundred sixty-nine thousand, nine hundred twenty".