9999999999998 has 8 divisors (see below), whose sum is σ = 15030549899640. Its totient is φ = 4989816700120.

The previous prime is 9999999999971. The next prime is 10000000000037. The reversal of 9999999999998 is 8999999999999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-9 number, since 9×9999999999998⁹ (a number of 118 digits) contains 999999999 as substring.

It is a Curzon number.

It is a nialpdrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5091648713 + ... + 5091650676.

It is an arithmetic number, because the mean of its divisors is an integer number (1878818737455).

Almost surely, 2^{9999999999998} is an apocalyptic number.

9999999999998 is a deficient number, since it is larger than the sum of its proper divisors (5030549899642).

9999999999998 is a wasteful number, since it uses less digits than its factorization.

9999999999998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10183299882.

The product of its digits is 2259436291848, while the sum is 116.

Subtracting from 9999999999998 its reverse (8999999999999), we obtain a palindrome (999999999999).

The spelling of 9999999999998 in words is "nine trillion, nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-eight".