99990000009998 has 24 divisors (see below), whose sum is σ = 174494127423384. Its totient is φ = 42847507558800.

The previous prime is 99990000009989. The next prime is 99990000010031. The reversal of 99990000009998 is 89990000009999.

99990000009998 is digitally balanced in base 8, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62896493 + ... + 64466648.

It is an arithmetic number, because the mean of its divisors is an integer number (7270588642641).

Almost surely, 2^{99990000009998} is an apocalyptic number.

99990000009998 is a gapful number since it is divisible by the number (98) formed by its first and last digit.

99990000009998 is a deficient number, since it is larger than the sum of its proper divisors (74504127413386).

99990000009998 is a wasteful number, since it uses less digits than its factorization.

99990000009998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127371168 (or 127371161 counting only the distinct ones).

The product of its (nonzero) digits is 38263752, while the sum is 71.

Subtracting from 99990000009998 its reverse (89990000009999), we obtain a palindrome (9999999999999).

The spelling of 99990000009998 in words is "ninety-nine trillion, nine hundred ninety billion, nine thousand, nine hundred ninety-eight".