195663 has 16 divisors (see below), whose sum is σ = 292320. Its totient is φ = 115584.

The previous prime is 195659. The next prime is 195677. The reversal of 195663 is 366591.

It is a happy number.

It is not a de Polignac number, because 195663 - 2² = 195659 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 195663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195163) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1045 + ... + 1217.

It is an arithmetic number, because the mean of its divisors is an integer number (18270).

2¹⁹⁵⁶⁶³ is an apocalyptic number.

195663 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

195663 is a deficient number, since it is larger than the sum of its proper divisors (96657).

195663 is a wasteful number, since it uses less digits than its factorization.

195663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218.

The product of its digits is 4860, while the sum is 30.

The square root of 195663 is about 442.3381059778. The cubic root of 195663 is about 58.0545463866.

It can be divided in two parts, 195 and 663, that added together give a palindrome (858).

The spelling of 195663 in words is "one hundred ninety-five thousand, six hundred sixty-three".