664340513 has 4 divisors (see below), whose sum is σ = 682295700. Its totient is φ = 646385328.

The previous prime is 664340483. The next prime is 664340543. The reversal of 664340513 is 315043466.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (664340483) and next prime (664340543).

It can be written as a sum of positive squares in 2 ways, for example, as 330803344 + 333537169 = 18188^2 + 18263^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664340513 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 664340513.

It is not an unprimeable number, because it can be changed into a prime (664340543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8977538 + ... + 8977611.

It is an arithmetic number, because the mean of its divisors is an integer number (170573925).

Almost surely, 2^664340513 is an apocalyptic number.

It is an amenable number.

664340513 is a deficient number, since it is larger than the sum of its proper divisors (17955187).

664340513 is a wasteful number, since it uses less digits than its factorization.

664340513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17955186.

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 664340513 is about 25774.8038401847. The cubic root of 664340513 is about 872.5632395056.

Adding to 664340513 its reverse (315043466), we get a palindrome (979383979).

The spelling of 664340513 in words is "six hundred sixty-four million, three hundred forty thousand, five hundred thirteen".