665695 has 8 divisors (see below), whose sum is σ = 826560. Its totient is φ = 514080.

The previous prime is 665677. The next prime is 665713. The reversal of 665695 is 596566.

It is a happy number.

665695 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (665677) and next prime (665713).

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

It is a de Polignac number, because none of the positive numbers 2^k-665695 is a prime.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2151 + ... + 2440.

It is an arithmetic number, because the mean of its divisors is an integer number (103320).

2⁶⁶⁵⁶⁹⁵ is an apocalyptic number.

665695 is a deficient number, since it is larger than the sum of its proper divisors (160865).

665695 is a wasteful number, since it uses less digits than its factorization.

665695 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4625.

The product of its digits is 48600, while the sum is 37.

The square root of 665695 is about 815.9013420751. The cubic root of 665695 is about 87.3155843865.

The spelling of 665695 in words is "six hundred sixty-five thousand, six hundred ninety-five".