660506 has 16 divisors (see below), whose sum is σ = 1235520. Its totient is φ = 257280.

The previous prime is 660503. The next prime is 660509. The reversal of 660506 is 605066.

It is a happy number.

660506 is nontrivially palindromic in base 16.

It is an interprime number because it is at equal distance from previous prime (660503) and next prime (660509).

It is not an unprimeable number, because it can be changed into a prime (660503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1991 + ... + 2298.

It is an arithmetic number, because the mean of its divisors is an integer number (77220).

2⁶⁶⁰⁵⁰⁶ is an apocalyptic number.

660506 is a deficient number, since it is larger than the sum of its proper divisors (575014).

660506 is a wasteful number, since it uses less digits than its factorization.

660506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4309.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 660506 is about 812.7152022695. The cubic root of 660506 is about 87.0881213965.

The spelling of 660506 in words is "six hundred sixty thousand, five hundred six".