666789017227 has 2 divisors, whose sum is σ = 666789017228. Its totient is φ = 666789017226.

The previous prime is 666789017207. The next prime is 666789017291. The reversal of 666789017227 is 722710987666.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666789017227 is a prime.

It is not a weakly prime, because it can be changed into another prime (666789017207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333394508613 + 333394508614.

It is an arithmetic number, because the mean of its divisors is an integer number (333394508614).

Almost surely, 2^666789017227 is an apocalyptic number.

666789017227 is a deficient number, since it is larger than the sum of its proper divisors (1).

666789017227 is an equidigital number, since it uses as much as digits as its factorization.

666789017227 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21337344, while the sum is 61.

The spelling of 666789017227 in words is "six hundred sixty-six billion, seven hundred eighty-nine million, seventeen thousand, two hundred twenty-seven".