660567 has 4 divisors (see below), whose sum is σ = 880760. Its totient is φ = 440376.

The previous prime is 660563. The next prime is 660589. The reversal of 660567 is 765066.

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

It is not a de Polignac number, because 660567 - 2² = 660563 is a prime.

It is a super-2 number, since 2×660567² = 872697522978, which contains 22 as substring.

It is a D-number.

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 660567.

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, 110092 + ... + 110097.

It is an arithmetic number, because the mean of its divisors is an integer number (220190).

2⁶⁶⁰⁵⁶⁷ is an apocalyptic number.

660567 is a deficient number, since it is larger than the sum of its proper divisors (220193).

660567 is a wasteful number, since it uses less digits than its factorization.

660567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220192.

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 660567 is about 812.7527299247. The cubic root of 660567 is about 87.0908022765.

The spelling of 660567 in words is "six hundred sixty thousand, five hundred sixty-seven".