9900999990099 has 40 divisors (see below), whose sum is σ = 15191702504528. Its totient is φ = 6421602369600.

The previous prime is 9900999990083. The next prime is 9900999990113.

9900999990099 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 9900999990099 - 2⁴ = 9900999990083 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 zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (9900999990599) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 29506464 + ... + 29840130.

Almost surely, 2^{9900999990099} is an apocalyptic number.

9900999990099 is a deficient number, since it is larger than the sum of its proper divisors (5290702514429).

9900999990099 is a wasteful number, since it uses less digits than its factorization.

9900999990099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343617 (or 343608 counting only the distinct ones).

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

It can be divided in two parts, 9900 and 999990099, that added together give a palindrome (999999999).

The spelling of 9900999990099 in words is "nine trillion, nine hundred billion, nine hundred ninety-nine million, nine hundred ninety thousand, ninety-nine".