666733393 has 2 divisors, whose sum is σ = 666733394. Its totient is φ = 666733392.

The previous prime is 666733391. The next prime is 666733409. The reversal of 666733393 is 393337666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 474716944 + 192016449 = 21788^2 + 13857^2 .

It is a cyclic number.

It is not a de Polignac number, because 666733393 - 2¹ = 666733391 is a prime.

Together with 666733391, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (666733391) 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, 333366696 + 333366697.

It is an arithmetic number, because the mean of its divisors is an integer number (333366697).

Almost surely, 2^666733393 is an apocalyptic number.

It is an amenable number.

666733393 is a deficient number, since it is larger than the sum of its proper divisors (1).

666733393 is an equidigital number, since it uses as much as digits as its factorization.

666733393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1102248, while the sum is 46.

The square root of 666733393 is about 25821.1810922738. The cubic root of 666733393 is about 873.6096091746.

The spelling of 666733393 in words is "six hundred sixty-six million, seven hundred thirty-three thousand, three hundred ninety-three".