198195885517 has 32 divisors (see below), whose sum is σ = 240639759360. Its totient is φ = 159352738560.

The previous prime is 198195885487. The next prime is 198195885527. The reversal of 198195885517 is 715588591891.

It is a cyclic number.

It is not a de Polignac number, because 198195885517 - 2¹¹ = 198195883469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198195885527) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 50212338 + ... + 50216284.

It is an arithmetic number, because the mean of its divisors is an integer number (7519992480).

Almost surely, 2^198195885517 is an apocalyptic number.

198195885517 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

198195885517 is a deficient number, since it is larger than the sum of its proper divisors (42443873843).

198195885517 is a wasteful number, since it uses less digits than its factorization.

198195885517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5281.

The product of its digits is 36288000, while the sum is 67.

The spelling of 198195885517 in words is "one hundred ninety-eight billion, one hundred ninety-five million, eight hundred eighty-five thousand, five hundred seventeen".