99909999990999 has 128 divisors (see below), whose sum is σ = 169333730472960. Its totient is φ = 57683724134400.

The previous prime is 99909999990991. The next prime is 99909999991031.

99909999990999 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 99909999990999 - 2³ = 99909999990991 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 99909999990999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99909999990991) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 109446444 + ... + 110355534.

It is an arithmetic number, because the mean of its divisors is an integer number (1322919769320).

Almost surely, 2^{99909999990999} is an apocalyptic number.

99909999990999 is a gapful number since it is divisible by the number (99) formed by its first and last digit.

99909999990999 is a deficient number, since it is larger than the sum of its proper divisors (69423730481961).

99909999990999 is a wasteful number, since it uses less digits than its factorization.

99909999990999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 909358 (or 909352 counting only the distinct ones).

The product of its (nonzero) digits is 282429536481, while the sum is 108.

The spelling of 99909999990999 in words is "ninety-nine trillion, nine hundred nine billion, nine hundred ninety-nine million, nine hundred ninety thousand, nine hundred ninety-nine".