99999999899 has 8 divisors (see below), whose sum is σ = 102618793200. Its totient is φ = 97394534496.

The previous prime is 99999999871. The next prime is 99999999907. The reversal of 99999999899 is 99899999999.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 99999999899 - 2²⁴ = 99983222683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99999999829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3316772 + ... + 3346785.

It is an arithmetic number, because the mean of its divisors is an integer number (12827349150).

Almost surely, 2^99999999899 is an apocalyptic number.

99999999899 is a deficient number, since it is larger than the sum of its proper divisors (2618793301).

99999999899 is a wasteful number, since it uses less digits than its factorization.

99999999899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6663949.

The product of its digits is 27894275208, while the sum is 98.

The spelling of 99999999899 in words is "ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, eight hundred ninety-nine".