664646113 has 2 divisors, whose sum is σ = 664646114. Its totient is φ = 664646112.

The previous prime is 664646077. The next prime is 664646117. The reversal of 664646113 is 311646466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 514019584 + 150626529 = 22672^2 + 12273^2 .

It is a cyclic number.

It is not a de Polignac number, because 664646113 - 2¹⁷ = 664515041 is a prime.

It is not a weakly prime, because it can be changed into another prime (664646117) 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, 332323056 + 332323057.

It is an arithmetic number, because the mean of its divisors is an integer number (332323057).

Almost surely, 2^664646113 is an apocalyptic number.

It is an amenable number.

664646113 is a deficient number, since it is larger than the sum of its proper divisors (1).

664646113 is an equidigital number, since it uses as much as digits as its factorization.

664646113 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 37.

The square root of 664646113 is about 25780.7314287241. The cubic root of 664646113 is about 872.6970134984.

The spelling of 664646113 in words is "six hundred sixty-four million, six hundred forty-six thousand, one hundred thirteen".