66365231 has 2 divisors, whose sum is σ = 66365232. Its totient is φ = 66365230.

The previous prime is 66365213. The next prime is 66365237. The reversal of 66365231 is 13256366.

Together with previous prime (66365213) 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 a de Polignac number, because none of the positive numbers 2^k-66365231 is a prime.

It is a super-2 number, since 2×66365231² = 8808687771366722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66365237) 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, 33182615 + 33182616.

It is an arithmetic number, because the mean of its divisors is an integer number (33182616).

Almost surely, 2^66365231 is an apocalyptic number.

66365231 is a deficient number, since it is larger than the sum of its proper divisors (1).

66365231 is an equidigital number, since it uses as much as digits as its factorization.

66365231 is an odious number, because the sum of its binary digits is odd.

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

The square root of 66365231 is about 8146.4858067758. The cubic root of 66365231 is about 404.8680787632.

The spelling of 66365231 in words is "sixty-six million, three hundred sixty-five thousand, two hundred thirty-one".