198975168918 has 12 divisors (see below), whose sum is σ = 431112866028. Its totient is φ = 66325056300.

The previous prime is 198975168913. The next prime is 198975168937. The reversal of 198975168918 is 819861579891.

198975168918 is a `hidden beast` number, since 1 + 9 + 8 + 97 + 516 + 8 + 9 + 18 = 666.

It is a super-2 number, since 2×198975168918² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198975168913) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5527088008 + ... + 5527088043.

It is an arithmetic number, because the mean of its divisors is an integer number (35926072169).

Almost surely, 2^198975168918 is an apocalyptic number.

198975168918 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

198975168918 is an abundant number, since it is smaller than the sum of its proper divisors (232137697110).

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

198975168918 is a wasteful number, since it uses less digits than its factorization.

198975168918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11054176059 (or 11054176056 counting only the distinct ones).

The product of its digits is 78382080, while the sum is 72.

It can be divided in two parts, 19897 and 5168918, that added together give a palindrome (5188815).

The spelling of 198975168918 in words is "one hundred ninety-eight billion, nine hundred seventy-five million, one hundred sixty-eight thousand, nine hundred eighteen".