1999999999998 has 512 divisors, whose sum is σ = 6189950914560. Its totient is φ = 461894400000.

The previous prime is 1999999999981. The next prime is 2000000000003. The reversal of 1999999999998 is 8999999999991.

It is a self number, because there is not a number n which added to its sum of digits gives 1999999999998.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 201994848 + ... + 202004748.

It is an arithmetic number, because the mean of its divisors is an integer number (12089747880).

Almost surely, 2^{1999999999998} is an apocalyptic number.

1999999999998 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1999999999998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3094975457280).

1999999999998 is an abundant number, since it is smaller than the sum of its proper divisors (4189950914562).

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

1999999999998 is a wasteful number, since it uses less digits than its factorization.

1999999999998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10081 (or 10075 counting only the distinct ones).

The product of its digits is 251048476872, while the sum is 108.

It can be divided in two parts, 1 and 999999999998, that added together give a palindrome (999999999999).

The spelling of 1999999999998 in words is "one trillion, nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-eight".