663695 has 4 divisors (see below), whose sum is σ = 796440. Its totient is φ = 530952.

The previous prime is 663683. The next prime is 663709. The reversal of 663695 is 596366.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 663695 - 2⁶ = 663631 is a prime.

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, 66365 + ... + 66374.

It is an arithmetic number, because the mean of its divisors is an integer number (199110).

2⁶⁶³⁶⁹⁵ is an apocalyptic number.

663695 is a deficient number, since it is larger than the sum of its proper divisors (132745).

663695 is a wasteful number, since it uses less digits than its factorization.

663695 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132744.

The product of its digits is 29160, while the sum is 35.

The square root of 663695 is about 814.6747817381. The cubic root of 663695 is about 87.2280536368.

The spelling of 663695 in words is "six hundred sixty-three thousand, six hundred ninety-five".