664838655023 has 2 divisors, whose sum is σ = 664838655024. Its totient is φ = 664838655022.

The previous prime is 664838655001. The next prime is 664838655083. The reversal of 664838655023 is 320556838466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 664838655023 - 2¹⁸ = 664838392879 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 664838655023.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664838655083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332419327511 + 332419327512.

It is an arithmetic number, because the mean of its divisors is an integer number (332419327512).

Almost surely, 2^664838655023 is an apocalyptic number.

664838655023 is a deficient number, since it is larger than the sum of its proper divisors (1).

664838655023 is an equidigital number, since it uses as much as digits as its factorization.

664838655023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24883200, while the sum is 56.

The spelling of 664838655023 in words is "six hundred sixty-four billion, eight hundred thirty-eight million, six hundred fifty-five thousand, twenty-three".