665198 has 8 divisors (see below), whose sum is σ = 1030080. Its totient is φ = 321840.

The previous prime is 665179. The next prime is 665201. The reversal of 665198 is 891566.

665198 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 Curzon number.

It is a congruent number.

It is an unprimeable number.

665198 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5303 + ... + 5426.

It is an arithmetic number, because the mean of its divisors is an integer number (128760).

2⁶⁶⁵¹⁹⁸ is an apocalyptic number.

665198 is a deficient number, since it is larger than the sum of its proper divisors (364882).

665198 is a wasteful number, since it uses less digits than its factorization.

665198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10762.

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

The square root of 665198 is about 815.5967140689. The cubic root of 665198 is about 87.2938493830.

The spelling of 665198 in words is "six hundred sixty-five thousand, one hundred ninety-eight".