666695 has 8 divisors (see below), whose sum is σ = 817344. Its totient is φ = 521824.

The previous prime is 666683. The next prime is 666697. The reversal of 666695 is 596666.

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

It is a cyclic number.

It is not a de Polignac number, because 666695 - 2⁸ = 666439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666697) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1184 + ... + 1653.

It is an arithmetic number, because the mean of its divisors is an integer number (102168).

2⁶⁶⁶⁶⁹⁵ is an apocalyptic number.

666695 is a deficient number, since it is larger than the sum of its proper divisors (150649).

666695 is a wasteful number, since it uses less digits than its factorization.

666695 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2889.

The product of its digits is 58320, while the sum is 38.

The square root of 666695 is about 816.5139312957. The cubic root of 666695 is about 87.3592840284.

The spelling of 666695 in words is "six hundred sixty-six thousand, six hundred ninety-five".