666395 has 4 divisors (see below), whose sum is σ = 799680. Its totient is φ = 533112.

The previous prime is 666353. The next prime is 666403. The reversal of 666395 is 593666.

666395 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 593666 = 2 ⋅296833.

It is a cyclic number.

It is not a de Polignac number, because 666395 - 2⁸ = 666139 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 666395.

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, 66635 + ... + 66644.

It is an arithmetic number, because the mean of its divisors is an integer number (199920).

2⁶⁶⁶³⁹⁵ is an apocalyptic number.

666395 is a deficient number, since it is larger than the sum of its proper divisors (133285).

666395 is a wasteful number, since it uses less digits than its factorization.

666395 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133284.

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

The square root of 666395 is about 816.3302027979. The cubic root of 666395 is about 87.3461787268.

The spelling of 666395 in words is "six hundred sixty-six thousand, three hundred ninety-five".