664148393 has 2 divisors, whose sum is σ = 664148394. Its totient is φ = 664148392.

The previous prime is 664148383. The next prime is 664148417. The reversal of 664148393 is 393841466.

664148393 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., 643281769 + 20866624 = 25363^2 + 4568^2 .

It is a cyclic number.

It is not a de Polignac number, because 664148393 - 2¹⁰ = 664147369 is a prime.

It is not a weakly prime, because it can be changed into another prime (664148383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332074196 + 332074197.

It is an arithmetic number, because the mean of its divisors is an integer number (332074197).

Almost surely, 2^664148393 is an apocalyptic number.

It is an amenable number.

664148393 is a deficient number, since it is larger than the sum of its proper divisors (1).

664148393 is an equidigital number, since it uses as much as digits as its factorization.

664148393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 373248, while the sum is 44.

The square root of 664148393 is about 25771.0766752187. The cubic root of 664148393 is about 872.4791194856.

The spelling of 664148393 in words is "six hundred sixty-four million, one hundred forty-eight thousand, three hundred ninety-three".