664755 has 32 divisors (see below), whose sum is σ = 1311744. Its totient is φ = 279936.

The previous prime is 664739. The next prime is 664757. The reversal of 664755 is 557466.

It is not a de Polignac number, because 664755 - 2⁴ = 664739 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664757) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1122 + ... + 1608.

It is an arithmetic number, because the mean of its divisors is an integer number (40992).

2⁶⁶⁴⁷⁵⁵ is an apocalyptic number.

664755 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

664755 is a deficient number, since it is larger than the sum of its proper divisors (646989).

664755 is a wasteful number, since it uses less digits than its factorization.

664755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515.

The product of its digits is 25200, while the sum is 33.

The square root of 664755 is about 815.3250885383. The cubic root of 664755 is about 87.2744668017.

Adding to 664755 its reverse (557466), we get a palindrome (1222221).

The spelling of 664755 in words is "six hundred sixty-four thousand, seven hundred fifty-five".