99999899999 has 4 divisors (see below), whose sum is σ = 100719323880. Its totient is φ = 99280476120.

The previous prime is 99999899983. The next prime is 99999900067.

It is a happy number.

99999899999 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 99999899999 - 2⁴ = 99999899983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99999893999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 359711732 + ... + 359712009.

It is an arithmetic number, because the mean of its divisors is an integer number (25179830970).

Almost surely, 2^99999899999 is an apocalyptic number.

99999899999 is a deficient number, since it is larger than the sum of its proper divisors (719423881).

99999899999 is a wasteful number, since it uses less digits than its factorization.

99999899999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 719423880.

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

The spelling of 99999899999 in words is "ninety-nine billion, nine hundred ninety-nine million, eight hundred ninety-nine thousand, nine hundred ninety-nine".