655664 has 20 divisors (see below), whose sum is σ = 1301256. Its totient is φ = 319872.

The previous prime is 655657. The next prime is 655687. The reversal of 655664 is 466556.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 655664.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 655664.

It is an unprimeable number.

655664 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 212 + ... + 1164.

2⁶⁵⁵⁶⁶⁴ is an apocalyptic number.

It is an amenable number.

655664 is a deficient number, since it is larger than the sum of its proper divisors (645592).

655664 is a wasteful number, since it uses less digits than its factorization.

655664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1004 (or 998 counting only the distinct ones).

The product of its digits is 21600, while the sum is 32.

The square root of 655664 is about 809.7308194703. The cubic root of 655664 is about 86.8747923670.

The spelling of 655664 in words is "six hundred fifty-five thousand, six hundred sixty-four".