666910513 has 2 divisors, whose sum is σ = 666910514. Its totient is φ = 666910512.

The previous prime is 666910483. The next prime is 666910537. The reversal of 666910513 is 315019666.

666910513 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 656230689 + 10679824 = 25617^2 + 3268^2 .

It is a cyclic number.

It is not a de Polignac number, because 666910513 - 2¹³ = 666902321 is a prime.

It is not a weakly prime, because it can be changed into another prime (666910613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333455256 + 333455257.

It is an arithmetic number, because the mean of its divisors is an integer number (333455257).

Almost surely, 2^666910513 is an apocalyptic number.

It is an amenable number.

666910513 is a deficient number, since it is larger than the sum of its proper divisors (1).

666910513 is an equidigital number, since it uses as much as digits as its factorization.

666910513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29160, while the sum is 37.

The square root of 666910513 is about 25824.6106069385. The cubic root of 666910513 is about 873.6869614495.

The spelling of 666910513 in words is "six hundred sixty-six million, nine hundred ten thousand, five hundred thirteen".