664447140164237 has 2 divisors, whose sum is σ = 664447140164238. Its totient is φ = 664447140164236.

The previous prime is 664447140164207. The next prime is 664447140164243. The reversal of 664447140164237 is 732461041744466.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 652390647879721 + 12056492284516 = 25541939^2 + 3472246^2 .

It is a cyclic number.

It is not a de Polignac number, because 664447140164237 - 2⁸ = 664447140163981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664447140164207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332223570082118 + 332223570082119.

It is an arithmetic number, because the mean of its divisors is an integer number (332223570082119).

Almost surely, 2^{664447140164237} is an apocalyptic number.

It is an amenable number.

664447140164237 is a deficient number, since it is larger than the sum of its proper divisors (1).

664447140164237 is an equidigital number, since it uses as much as digits as its factorization.

664447140164237 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 65028096, while the sum is 59.

The spelling of 664447140164237 in words is "six hundred sixty-four trillion, four hundred forty-seven billion, one hundred forty million, one hundred sixty-four thousand, two hundred thirty-seven".