198997913718 has 24 divisors (see below), whose sum is σ = 433350794448. Its totient is φ = 65995922832.

The previous prime is 198997913677. The next prime is 198997913729. The reversal of 198997913718 is 817319799891.

198997913718 is a `hidden beast` number, since 1 + 9 + 89 + 97 + 91 + 371 + 8 = 666.

198997913718 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28055946 + ... + 28063037.

It is an arithmetic number, because the mean of its divisors is an integer number (18056283102).

Almost surely, 2^198997913718 is an apocalyptic number.

198997913718 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

198997913718 is an abundant number, since it is smaller than the sum of its proper divisors (234352880730).

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

198997913718 is a wasteful number, since it uses less digits than its factorization.

198997913718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56119188 (or 56119185 counting only the distinct ones).

The product of its digits is 61725888, while the sum is 72.

The spelling of 198997913718 in words is "one hundred ninety-eight billion, nine hundred ninety-seven million, nine hundred thirteen thousand, seven hundred eighteen".