664860338293 has 2 divisors, whose sum is σ = 664860338294. Its totient is φ = 664860338292.

The previous prime is 664860338257. The next prime is 664860338299. The reversal of 664860338293 is 392833068466.

664860338293 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 652317906244 + 12542432049 = 807662^2 + 111993^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664860338293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664860338299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332430169146 + 332430169147.

It is an arithmetic number, because the mean of its divisors is an integer number (332430169147).

Almost surely, 2^664860338293 is an apocalyptic number.

It is an amenable number.

664860338293 is a deficient number, since it is larger than the sum of its proper divisors (1).

664860338293 is an equidigital number, since it uses as much as digits as its factorization.

664860338293 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26873856, while the sum is 58.

The spelling of 664860338293 in words is "six hundred sixty-four billion, eight hundred sixty million, three hundred thirty-eight thousand, two hundred ninety-three".