660505 has 8 divisors (see below), whose sum is σ = 806400. Its totient is φ = 519216.

The previous prime is 660503. The next prime is 660509. The reversal of 660505 is 505066.

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

It is a cyclic number.

It is not a de Polignac number, because 660505 - 2¹ = 660503 is a prime.

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, 825 + ... + 1414.

It is an arithmetic number, because the mean of its divisors is an integer number (100800).

2⁶⁶⁰⁵⁰⁵ is an apocalyptic number.

It is an amenable number.

660505 is a deficient number, since it is larger than the sum of its proper divisors (145895).

660505 is a wasteful number, since it uses less digits than its factorization.

660505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2303.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 660505 is about 812.7145870476. The cubic root of 660505 is about 87.0880774463.

The spelling of 660505 in words is "six hundred sixty thousand, five hundred five".