198116557 has 4 divisors (see below), whose sum is σ = 199332160. Its totient is φ = 196900956.

The previous prime is 198116539. The next prime is 198116563. The reversal of 198116557 is 755611891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198116557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198116507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 607557 + ... + 607882.

It is an arithmetic number, because the mean of its divisors is an integer number (49833040).

Almost surely, 2^198116557 is an apocalyptic number.

It is an amenable number.

198116557 is a deficient number, since it is larger than the sum of its proper divisors (1215603).

198116557 is a wasteful number, since it uses less digits than its factorization.

198116557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1215602.

The product of its digits is 75600, while the sum is 43.

The square root of 198116557 is about 14075.3883427776. The cubic root of 198116557 is about 582.9620145365.

The spelling of 198116557 in words is "one hundred ninety-eight million, one hundred sixteen thousand, five hundred fifty-seven".