663198 has 8 divisors (see below), whose sum is σ = 1326408. Its totient is φ = 221064.

The previous prime is 663191. The next prime is 663203. The reversal of 663198 is 891366.

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

663198 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663191) by changing a digit.

663198 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55261 + ... + 55272.

It is an arithmetic number, because the mean of its divisors is an integer number (165801).

2⁶⁶³¹⁹⁸ is an apocalyptic number.

663198 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

663198 is a wasteful number, since it uses less digits than its factorization.

663198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110538.

The product of its digits is 7776, while the sum is 33.

The square root of 663198 is about 814.3696949175. The cubic root of 663198 is about 87.2062749742.

It can be divided in two parts, 663 and 198, that added together give a triangular number (861 = T₄₁).

The spelling of 663198 in words is "six hundred sixty-three thousand, one hundred ninety-eight".