19999999999998 has 48 divisors (see below), whose sum is σ = 44709816265920. Its totient is φ = 6458084523072.

The previous prime is 19999999999997. The next prime is 20000000000021. The reversal of 19999999999998 is 89999999999991.

It is a super-9 number, since 9×19999999999998⁹ (a number of 121 digits) contains 999999999 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19999999999997) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 132610461 + ... + 132761192.

It is an arithmetic number, because the mean of its divisors is an integer number (931454505540).

Almost surely, 2^{19999999999998} is an apocalyptic number.

19999999999998 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

19999999999998 is an abundant number, since it is smaller than the sum of its proper divisors (24709816265922).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19999999999998 is a wasteful number, since it uses less digits than its factorization.

19999999999998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265371793 (or 265371790 counting only the distinct ones).

The product of its digits is 2259436291848, while the sum is 117.

It can be divided in two parts, 1 and 9999999999998, that added together give a palindrome (9999999999999).

The spelling of 19999999999998 in words is "nineteen trillion, nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-eight".