666573 has 8 divisors (see below), whose sum is σ = 899808. Its totient is φ = 438864.

The previous prime is 666559. The next prime is 666599. The reversal of 666573 is 375666.

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

It is not a de Polignac number, because 666573 - 2⁴ = 666557 is a prime.

666573 is a lucky 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 666573.

It is not an unprimeable number, because it can be changed into a prime (666073) 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 7 ways as a sum of consecutive naturals, for example, 1090 + ... + 1587.

It is an arithmetic number, because the mean of its divisors is an integer number (112476).

2⁶⁶⁶⁵⁷³ is an apocalyptic number.

It is an amenable number.

666573 is a deficient number, since it is larger than the sum of its proper divisors (233235).

666573 is a wasteful number, since it uses less digits than its factorization.

666573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2763.

The product of its digits is 22680, while the sum is 33.

The square root of 666573 is about 816.4392200280. The cubic root of 666573 is about 87.3539550135.

The spelling of 666573 in words is "six hundred sixty-six thousand, five hundred seventy-three".