666327331 has 2 divisors, whose sum is σ = 666327332. Its totient is φ = 666327330.

The previous prime is 666327313. The next prime is 666327341. The reversal of 666327331 is 133723666.

Together with previous prime (666327313) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 666327331 - 2⁹ = 666326819 is a prime.

It is a super-2 number, since 2×666327331² = 887984224075167122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (666327301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333163665 + 333163666.

It is an arithmetic number, because the mean of its divisors is an integer number (333163666).

Almost surely, 2^666327331 is an apocalyptic number.

666327331 is a deficient number, since it is larger than the sum of its proper divisors (1).

666327331 is an equidigital number, since it uses as much as digits as its factorization.

666327331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 37.

The square root of 666327331 is about 25813.3169313825. The cubic root of 666327331 is about 873.4322210766.

The spelling of 666327331 in words is "six hundred sixty-six million, three hundred twenty-seven thousand, three hundred thirty-one".