664953 has 12 divisors (see below), whose sum is σ = 929040. Its totient is φ = 423016.

The previous prime is 664949. The next prime is 664967. The reversal of 664953 is 359466.

It is a happy number.

664953 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 664953 - 2² = 664949 is a prime.

It is a Curzon number.

664953 is a lucky number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (664933) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1378 + ... + 1796.

It is an arithmetic number, because the mean of its divisors is an integer number (77420).

2⁶⁶⁴⁹⁵³ is an apocalyptic number.

It is an amenable number.

664953 is a deficient number, since it is larger than the sum of its proper divisors (264087).

664953 is a wasteful number, since it uses less digits than its factorization.

664953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468 (or 445 counting only the distinct ones).

The product of its digits is 19440, while the sum is 33.

The square root of 664953 is about 815.4465034568. The cubic root of 664953 is about 87.2831309607.

The spelling of 664953 in words is "six hundred sixty-four thousand, nine hundred fifty-three".