664234513 has 2 divisors, whose sum is σ = 664234514. Its totient is φ = 664234512.

The previous prime is 664234477. The next prime is 664234579. The reversal of 664234513 is 315432466.

664234513 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 549808704 + 114425809 = 23448^2 + 10697^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664234513 is a prime.

It is not a weakly prime, because it can be changed into another prime (664234913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332117256 + 332117257.

It is an arithmetic number, because the mean of its divisors is an integer number (332117257).

Almost surely, 2^664234513 is an apocalyptic number.

It is an amenable number.

664234513 is a deficient number, since it is larger than the sum of its proper divisors (1).

664234513 is an equidigital number, since it uses as much as digits as its factorization.

664234513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 34.

The square root of 664234513 is about 25772.7474864439. The cubic root of 664234513 is about 872.5168292581.

Adding to 664234513 its reverse (315432466), we get a palindrome (979666979).

The spelling of 664234513 in words is "six hundred sixty-four million, two hundred thirty-four thousand, five hundred thirteen".