66317606317 has 2 divisors, whose sum is σ = 66317606318. Its totient is φ = 66317606316.

The previous prime is 66317606293. The next prime is 66317606351. The reversal of 66317606317 is 71360671366.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56990103076 + 9327503241 = 238726^2 + 96579^2 .

It is a cyclic number.

It is not a de Polignac number, because 66317606317 - 2³¹ = 64170122669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66317606387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33158803158 + 33158803159.

It is an arithmetic number, because the mean of its divisors is an integer number (33158803159).

Almost surely, 2^66317606317 is an apocalyptic number.

It is an amenable number.

66317606317 is a deficient number, since it is larger than the sum of its proper divisors (1).

66317606317 is an equidigital number, since it uses as much as digits as its factorization.

66317606317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 571536, while the sum is 46.

The spelling of 66317606317 in words is "sixty-six billion, three hundred seventeen million, six hundred six thousand, three hundred seventeen".