666027066073309 has 2 divisors, whose sum is σ = 666027066073310. Its totient is φ = 666027066073308.

The previous prime is 666027066073307. The next prime is 666027066073331. The reversal of 666027066073309 is 903370660720666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 617836743367684 + 48190322705625 = 24856322^2 + 6941925^2 .

It is a cyclic number.

It is not a de Polignac number, because 666027066073309 - 2¹ = 666027066073307 is a prime.

Together with 666027066073307, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666027066073307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333013533036654 + 333013533036655.

It is an arithmetic number, because the mean of its divisors is an integer number (333013533036655).

Almost surely, 2^{666027066073309} is an apocalyptic number.

It is an amenable number.

666027066073309 is a deficient number, since it is larger than the sum of its proper divisors (1).

666027066073309 is an equidigital number, since it uses as much as digits as its factorization.

666027066073309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 61725888, while the sum is 61.

The spelling of 666027066073309 in words is "six hundred sixty-six trillion, twenty-seven billion, sixty-six million, seventy-three thousand, three hundred nine".