664613 has 2 divisors, whose sum is σ = 664614. Its totient is φ = 664612.

The previous prime is 664603. The next prime is 664619. The reversal of 664613 is 316466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 386884 + 277729 = 622^2 + 527^2 .

It is a cyclic number.

It is not a de Polignac number, because 664613 - 2⁴ = 664597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664619) 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 as a sum of consecutive naturals, namely, 332306 + 332307.

It is an arithmetic number, because the mean of its divisors is an integer number (332307).

2⁶⁶⁴⁶¹³ is an apocalyptic number.

It is an amenable number.

664613 is a deficient number, since it is larger than the sum of its proper divisors (1).

664613 is an equidigital number, since it uses as much as digits as its factorization.

664613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 26.

The square root of 664613 is about 815.2380020583. The cubic root of 664613 is about 87.2682520525.

The spelling of 664613 in words is "six hundred sixty-four thousand, six hundred thirteen".