664601 has 12 divisors (see below), whose sum is σ = 804672. Its totient is φ = 537624.

The previous prime is 664597. The next prime is 664603. The reversal of 664601 is 106466.

It is not a de Polignac number, because 664601 - 2² = 664597 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664603) 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 11 ways as a sum of consecutive naturals, for example, 2396 + ... + 2658.

It is an arithmetic number, because the mean of its divisors is an integer number (67056).

2⁶⁶⁴⁶⁰¹ is an apocalyptic number.

It is an amenable number.

664601 is a deficient number, since it is larger than the sum of its proper divisors (140071).

664601 is a wasteful number, since it uses less digits than its factorization.

664601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308 (or 289 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 664601 is about 815.2306422111. The cubic root of 664601 is about 87.2677268218.

The spelling of 664601 in words is "six hundred sixty-four thousand, six hundred one".