999099990999 has 36 divisors (see below), whose sum is σ = 1620016620768. Its totient is φ = 592631814720.

The previous prime is 999099990961. The next prime is 999099991049.

999099990999 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 999099990999 - 2⁹ = 999099990487 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999099990919) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 9708894 + ... + 9811259.

It is an arithmetic number, because the mean of its divisors is an integer number (45000461688).

Almost surely, 2^999099990999 is an apocalyptic number.

999099990999 is a gapful number since it is divisible by the number (99) formed by its first and last digit.

999099990999 is a deficient number, since it is larger than the sum of its proper divisors (620916629769).

999099990999 is a wasteful number, since it uses less digits than its factorization.

999099990999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19520228 (or 19520214 counting only the distinct ones).

The product of its (nonzero) digits is 3486784401, while the sum is 90.

The spelling of 999099990999 in words is "nine hundred ninety-nine billion, ninety-nine million, nine hundred ninety thousand, nine hundred ninety-nine".