17991599198 has 16 divisors (see below), whose sum is σ = 27340313280. Its totient is φ = 8878255776.

The previous prime is 17991599141. The next prime is 17991599221. The reversal of 17991599198 is 89199519971.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 381740 + ... + 426272.

It is an arithmetic number, because the mean of its divisors is an integer number (1708769580).

Almost surely, 2^17991599198 is an apocalyptic number.

17991599198 is a deficient number, since it is larger than the sum of its proper divisors (9348714082).

17991599198 is a wasteful number, since it uses less digits than its factorization.

17991599198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47171.

The product of its digits is 16533720, while the sum is 68.

The spelling of 17991599198 in words is "seventeen billion, nine hundred ninety-one million, five hundred ninety-nine thousand, one hundred ninety-eight".