99999989999999 has 4 divisors (see below), whose sum is σ = 105263147368440. Its totient is φ = 94736832631560.

The previous prime is 99999989999983. The next prime is 99999990000107. The reversal of 99999989999999 is 99999998999999.

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 99999989999999 - 2⁴ = 99999989999983 is a prime.

It is a Duffinian number.

99999989999999 is a modest number, since divided by 9999999 gives 9999998 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99999989999599) 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 3 ways as a sum of consecutive naturals, for example, 2631578684192 + ... + 2631578684229.

It is an arithmetic number, because the mean of its divisors is an integer number (26315786842110).

Almost surely, 2^{99999989999999} is an apocalyptic number.

99999989999999 is a deficient number, since it is larger than the sum of its proper divisors (5263157368441).

99999989999999 is a wasteful number, since it uses less digits than its factorization.

99999989999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5263157368440.

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

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

The spelling of 99999989999999 in words is "ninety-nine trillion, nine hundred ninety-nine billion, nine hundred eighty-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".