66566546317 has 2 divisors, whose sum is σ = 66566546318. Its totient is φ = 66566546316.

The previous prime is 66566546311. The next prime is 66566546329. The reversal of 66566546317 is 71364566566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36660377961 + 29906168356 = 191469^2 + 172934^2 .

It is a cyclic number.

It is not a de Polignac number, because 66566546317 - 2³⁵ = 32206807949 is a prime.

It is a super-2 number, since 2×66566546317² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66566546311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33283273158 + 33283273159.

It is an arithmetic number, because the mean of its divisors is an integer number (33283273159).

Almost surely, 2^66566546317 is an apocalyptic number.

It is an amenable number.

66566546317 is a deficient number, since it is larger than the sum of its proper divisors (1).

66566546317 is an equidigital number, since it uses as much as digits as its factorization.

66566546317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16329600, while the sum is 55.

The spelling of 66566546317 in words is "sixty-six billion, five hundred sixty-six million, five hundred forty-six thousand, three hundred seventeen".