99990909999 has 20 divisors (see below), whose sum is σ = 153406145464. Its totient is φ = 64858966704.

The previous prime is 99990909983. The next prime is 99990910039.

99990909999 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 99990909999 - 2⁴ = 99990909983 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99990919999) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 16678837 + ... + 16684830.

Almost surely, 2^99990909999 is an apocalyptic number.

99990909999 is a deficient number, since it is larger than the sum of its proper divisors (53415235465).

99990909999 is a wasteful number, since it uses less digits than its factorization.

99990909999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33363716 (or 33363707 counting only the distinct ones).

The product of its (nonzero) digits is 387420489, while the sum is 81.

The spelling of 99990909999 in words is "ninety-nine billion, nine hundred ninety million, nine hundred nine thousand, nine hundred ninety-nine".