66365213 has 2 divisors, whose sum is σ = 66365214. Its totient is φ = 66365212.

The previous prime is 66365207. The next prime is 66365231. The reversal of 66365213 is 31256366.

Together with next prime (66365231) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62047129 + 4318084 = 7877^2 + 2078^2 .

It is a cyclic number.

It is not a de Polignac number, because 66365213 - 2⁶ = 66365149 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 66365213.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66365113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33182606 + 33182607.

It is an arithmetic number, because the mean of its divisors is an integer number (33182607).

Almost surely, 2^66365213 is an apocalyptic number.

It is an amenable number.

66365213 is a deficient number, since it is larger than the sum of its proper divisors (1).

66365213 is an equidigital number, since it uses as much as digits as its factorization.

66365213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 32.

The square root of 66365213 is about 8146.4847020049. The cubic root of 66365213 is about 404.8680421595.

The spelling of 66365213 in words is "sixty-six million, three hundred sixty-five thousand, two hundred thirteen".