664871639039 has 2 divisors, whose sum is σ = 664871639040. Its totient is φ = 664871639038.

The previous prime is 664871639027. The next prime is 664871639053. The reversal of 664871639039 is 930936178466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 664871639039 - 2²⁰ = 664870590463 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664871639539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332435819519 + 332435819520.

It is an arithmetic number, because the mean of its divisors is an integer number (332435819520).

Almost surely, 2^664871639039 is an apocalyptic number.

664871639039 is a deficient number, since it is larger than the sum of its proper divisors (1).

664871639039 is an equidigital number, since it uses as much as digits as its factorization.

664871639039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 35271936, while the sum is 62.

The spelling of 664871639039 in words is "six hundred sixty-four billion, eight hundred seventy-one million, six hundred thirty-nine thousand, thirty-nine".