666583 has 4 divisors (see below), whose sum is σ = 676600. Its totient is φ = 656568.

The previous prime is 666559. The next prime is 666599. The reversal of 666583 is 385666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 385666 = 2 ⋅192833.

It is a cyclic number.

It is not a de Polignac number, because 666583 - 2¹³ = 658391 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 (666683) 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, 4908 + ... + 5041.

It is an arithmetic number, because the mean of its divisors is an integer number (169150).

2⁶⁶⁶⁵⁸³ is an apocalyptic number.

666583 is a deficient number, since it is larger than the sum of its proper divisors (10017).

666583 is an equidigital number, since it uses as much as digits as its factorization.

666583 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10016.

The product of its digits is 25920, while the sum is 34.

The square root of 666583 is about 816.4453441597. The cubic root of 666583 is about 87.3543918425.

The spelling of 666583 in words is "six hundred sixty-six thousand, five hundred eighty-three".