666593 has 4 divisors (see below), whose sum is σ = 688128. Its totient is φ = 645060.

The previous prime is 666559. The next prime is 666599. The reversal of 666593 is 395666.

666593 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 a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 666593 - 2⁶ = 666529 is a prime.

It is a Duffinian number.

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 666593.

It is not an unprimeable number, because it can be changed into a prime (666599) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10721 + ... + 10782.

It is an arithmetic number, because the mean of its divisors is an integer number (172032).

2⁶⁶⁶⁵⁹³ is an apocalyptic number.

It is an amenable number.

666593 is a deficient number, since it is larger than the sum of its proper divisors (21535).

666593 is a wasteful number, since it uses less digits than its factorization.

666593 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21534.

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

The square root of 666593 is about 816.4514682454. The cubic root of 666593 is about 87.3548286671.

The spelling of 666593 in words is "six hundred sixty-six thousand, five hundred ninety-three".