99909900990999 has 48 divisors (see below), whose sum is σ = 161868739189248. Its totient is φ = 58856602320000.

The previous prime is 99909900990953. The next prime is 99909900991001.

99909900990999 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 99909900990999 - 2¹³ = 99909900982807 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99909900940999) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 44314057 + ... + 46514034.

It is an arithmetic number, because the mean of its divisors is an integer number (3372265399776).

Almost surely, 2^{99909900990999} is an apocalyptic number.

99909900990999 is a gapful number since it is divisible by the number (99) formed by its first and last digit.

99909900990999 is a deficient number, since it is larger than the sum of its proper divisors (61958838198249).

99909900990999 is a wasteful number, since it uses less digits than its factorization.

99909900990999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90828420 (or 90828417 counting only the distinct ones).

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

The spelling of 99909900990999 in words is "ninety-nine trillion, nine hundred nine billion, nine hundred million, nine hundred ninety thousand, nine hundred ninety-nine".