664350613 has 2 divisors, whose sum is σ = 664350614. Its totient is φ = 664350612.

The previous prime is 664350611. The next prime is 664350641. The reversal of 664350613 is 316053466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 505035729 + 159314884 = 22473^2 + 12622^2 .

It is a cyclic number.

It is not a de Polignac number, because 664350613 - 2¹ = 664350611 is a prime.

Together with 664350611, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664350611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332175306 + 332175307.

It is an arithmetic number, because the mean of its divisors is an integer number (332175307).

Almost surely, 2^664350613 is an apocalyptic number.

It is an amenable number.

664350613 is a deficient number, since it is larger than the sum of its proper divisors (1).

664350613 is an equidigital number, since it uses as much as digits as its factorization.

664350613 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 34.

The square root of 664350613 is about 25774.9997672163. Note that the first 3 decimals coincide. The cubic root of 664350613 is about 872.5676613565.

The spelling of 664350613 in words is "six hundred sixty-four million, three hundred fifty thousand, six hundred thirteen".