664838672341 has 2 divisors, whose sum is σ = 664838672342. Its totient is φ = 664838672340.

The previous prime is 664838672321. The next prime is 664838672389. The reversal of 664838672341 is 143276838466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 653292310225 + 11546362116 = 808265^2 + 107454^2 .

It is a cyclic number.

It is not a de Polignac number, because 664838672341 - 2⁹ = 664838671829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664838672321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332419336170 + 332419336171.

It is an arithmetic number, because the mean of its divisors is an integer number (332419336171).

Almost surely, 2^664838672341 is an apocalyptic number.

It is an amenable number.

664838672341 is a deficient number, since it is larger than the sum of its proper divisors (1).

664838672341 is an equidigital number, since it uses as much as digits as its factorization.

664838672341 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27869184, while the sum is 58.

The spelling of 664838672341 in words is "six hundred sixty-four billion, eight hundred thirty-eight million, six hundred seventy-two thousand, three hundred forty-one".