666310387 has 2 divisors, whose sum is σ = 666310388. Its totient is φ = 666310386.

The previous prime is 666310369. The next prime is 666310501. The reversal of 666310387 is 783013666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 666310387 - 2²³ = 657921779 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (666310987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333155193 + 333155194.

It is an arithmetic number, because the mean of its divisors is an integer number (333155194).

Almost surely, 2^666310387 is an apocalyptic number.

666310387 is a deficient number, since it is larger than the sum of its proper divisors (1).

666310387 is an equidigital number, since it uses as much as digits as its factorization.

666310387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 666310387 is about 25812.9887266082. The cubic root of 666310387 is about 873.4248175276.

The spelling of 666310387 in words is "six hundred sixty-six million, three hundred ten thousand, three hundred eighty-seven".