99819091899 has 24 divisors (see below), whose sum is σ = 144909632400. Its totient is φ = 66211145280.

The previous prime is 99819091873. The next prime is 99819091903.

99819091899 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 99819091899 - 2²⁰ = 99818043323 is a prime.

It is a super-2 number, since 2×99819091899² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (99819091819) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3222417 + ... + 3253245.

It is an arithmetic number, because the mean of its divisors is an integer number (6037901350).

Almost surely, 2^99819091899 is an apocalyptic number.

99819091899 is a deficient number, since it is larger than the sum of its proper divisors (45090540501).

99819091899 is a wasteful number, since it uses less digits than its factorization.

99819091899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32635 (or 32632 counting only the distinct ones).

The product of its (nonzero) digits is 34012224, while the sum is 72.

The spelling of 99819091899 in words is "ninety-nine billion, eight hundred nineteen million, ninety-one thousand, eight hundred ninety-nine".