660566 has 8 divisors (see below), whose sum is σ = 1014024. Its totient is φ = 322560.

The previous prime is 660563. The next prime is 660589. The reversal of 660566 is 665066.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660563) 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, 3755 + ... + 3926.

It is an arithmetic number, because the mean of its divisors is an integer number (126753).

2⁶⁶⁰⁵⁶⁶ is an apocalyptic number.

660566 is a deficient number, since it is larger than the sum of its proper divisors (353458).

660566 is a wasteful number, since it uses less digits than its factorization.

660566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7726.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 660566 is about 812.7521147312. The cubic root of 660566 is about 87.0907583290.

The spelling of 660566 in words is "six hundred sixty thousand, five hundred sixty-six".