664571052536647 has 2 divisors, whose sum is σ = 664571052536648. Its totient is φ = 664571052536646.

The previous prime is 664571052536639. The next prime is 664571052536669. The reversal of 664571052536647 is 746635250175466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 664571052536647 - 2³ = 664571052536639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664571052536617) 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, 332285526268323 + 332285526268324.

It is an arithmetic number, because the mean of its divisors is an integer number (332285526268324).

Almost surely, 2^{664571052536647} is an apocalyptic number.

664571052536647 is a deficient number, since it is larger than the sum of its proper divisors (1).

664571052536647 is an equidigital number, since it uses as much as digits as its factorization.

664571052536647 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 762048000, while the sum is 67.

The spelling of 664571052536647 in words is "six hundred sixty-four trillion, five hundred seventy-one billion, fifty-two million, five hundred thirty-six thousand, six hundred forty-seven".