99909990998 has 32 divisors (see below), whose sum is σ = 160802262720. Its totient is φ = 46391408640.

The previous prime is 99909990989. The next prime is 99909991007. The reversal of 99909990998 is 89909990999.

It is an interprime number because it is at equal distance from previous prime (99909990989) and next prime (99909991007).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 837215 + ... + 949077.

It is an arithmetic number, because the mean of its divisors is an integer number (5025070710).

Almost surely, 2^99909990998 is an apocalyptic number.

99909990998 is a deficient number, since it is larger than the sum of its proper divisors (60892271722).

99909990998 is a wasteful number, since it uses less digits than its factorization.

99909990998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112232.

The product of its (nonzero) digits is 344373768, while the sum is 80.

Subtracting from 99909990998 its reverse (89909990999), we obtain a palindrome (9999999999).

The spelling of 99909990998 in words is "ninety-nine billion, nine hundred nine million, nine hundred ninety thousand, nine hundred ninety-eight".