56666330765309 has 2 divisors, whose sum is σ = 56666330765310. Its totient is φ = 56666330765308.

The previous prime is 56666330765279. The next prime is 56666330765311. The reversal of 56666330765309 is 90356703366665.

56666330765309 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., 51960021388900 + 4706309376409 = 7208330^2 + 2169403^2 .

It is a cyclic number.

It is not a de Polignac number, because 56666330765309 - 2⁸ = 56666330765053 is a prime.

It is a super-2 number, since 2×56666330765309² (a number of 28 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 56666330765311, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56666330765339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28333165382654 + 28333165382655.

It is an arithmetic number, because the mean of its divisors is an integer number (28333165382655).

Almost surely, 2^{56666330765309} is an apocalyptic number.

It is an amenable number.

56666330765309 is a deficient number, since it is larger than the sum of its proper divisors (1).

56666330765309 is an equidigital number, since it uses as much as digits as its factorization.

56666330765309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 330674400, while the sum is 65.

The spelling of 56666330765309 in words is "fifty-six trillion, six hundred sixty-six billion, three hundred thirty million, seven hundred sixty-five thousand, three hundred nine".