666812455327 has 2 divisors, whose sum is σ = 666812455328. Its totient is φ = 666812455326.

The previous prime is 666812455321. The next prime is 666812455339. The reversal of 666812455327 is 723554218666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 666812455327 - 2³ = 666812455319 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666812455321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333406227663 + 333406227664.

It is an arithmetic number, because the mean of its divisors is an integer number (333406227664).

Almost surely, 2^666812455327 is an apocalyptic number.

666812455327 is a deficient number, since it is larger than the sum of its proper divisors (1).

666812455327 is an equidigital number, since it uses as much as digits as its factorization.

666812455327 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14515200, while the sum is 55.

The spelling of 666812455327 in words is "six hundred sixty-six billion, eight hundred twelve million, four hundred fifty-five thousand, three hundred twenty-seven".