99999998999999 has 16 divisors (see below), whose sum is σ = 116943933807360. Its totient is φ = 83720633451840.

The previous prime is 99999998999987. The next prime is 99999999000053. The reversal of 99999998999999 is 99999989999999.

It is not a de Polignac number, because 99999998999999 - 2¹² = 99999998995903 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 (99999998999959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 142652747 + ... + 143352035.

It is an arithmetic number, because the mean of its divisors is an integer number (7308995862960).

Almost surely, 2^{99999998999999} is an apocalyptic number.

99999998999999 is a deficient number, since it is larger than the sum of its proper divisors (16943934807361).

99999998999999 is a wasteful number, since it uses less digits than its factorization.

99999998999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1174430.

The product of its digits is 20334926626632, while the sum is 125.

Subtracting from 99999998999999 its reverse (99999989999999), we obtain a square (9000000 = 3000²).

The spelling of 99999998999999 in words is "ninety-nine trillion, nine hundred ninety-nine billion, nine hundred ninety-eight million, nine hundred ninety-nine thousand, nine hundred ninety-nine".