198566 has 8 divisors (see below), whose sum is σ = 301104. Its totient is φ = 98200.

The previous prime is 198553. The next prime is 198571. The reversal of 198566 is 665891.

198566 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 290 + ... + 693.

It is an arithmetic number, because the mean of its divisors is an integer number (37638).

2¹⁹⁸⁵⁶⁶ is an apocalyptic number.

198566 is a deficient number, since it is larger than the sum of its proper divisors (102538).

198566 is a wasteful number, since it uses less digits than its factorization.

198566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1086.

The product of its digits is 12960, while the sum is 35.

The square root of 198566 is about 445.6074505661. The cubic root of 198566 is about 58.3402513337.

The spelling of 198566 in words is "one hundred ninety-eight thousand, five hundred sixty-six".