66665386213 has 2 divisors, whose sum is σ = 66665386214. Its totient is φ = 66665386212.

The previous prime is 66665386201. The next prime is 66665386273. The reversal of 66665386213 is 31268356666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62021917764 + 4643468449 = 249042^2 + 68143^2 .

It is a cyclic number.

It is not a de Polignac number, because 66665386213 - 2²⁹ = 66128515301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66665386273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33332693106 + 33332693107.

It is an arithmetic number, because the mean of its divisors is an integer number (33332693107).

Almost surely, 2^66665386213 is an apocalyptic number.

It is an amenable number.

66665386213 is a deficient number, since it is larger than the sum of its proper divisors (1).

66665386213 is an equidigital number, since it uses as much as digits as its factorization.

66665386213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5598720, while the sum is 52.

The spelling of 66665386213 in words is "sixty-six billion, six hundred sixty-five million, three hundred eighty-six thousand, two hundred thirteen".