666579 has 4 divisors (see below), whose sum is σ = 888776. Its totient is φ = 444384.

The previous prime is 666559. The next prime is 666599. The reversal of 666579 is 975666.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (666559) and next prime (666599).

It is not a de Polignac number, because 666579 - 2⁹ = 666067 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111094 + ... + 111099.

It is an arithmetic number, because the mean of its divisors is an integer number (222194).

2⁶⁶⁶⁵⁷⁹ is an apocalyptic number.

666579 is a deficient number, since it is larger than the sum of its proper divisors (222197).

666579 is a wasteful number, since it uses less digits than its factorization.

666579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222196.

The product of its digits is 68040, while the sum is 39.

The square root of 666579 is about 816.4428945125. The cubic root of 666579 is about 87.3542171114.

It can be divided in two parts, 66657 and 9, that added together give a palindrome (66666).

The spelling of 666579 in words is "six hundred sixty-six thousand, five hundred seventy-nine".