66660000613 has 2 divisors, whose sum is σ = 66660000614. Its totient is φ = 66660000612.

The previous prime is 66660000611. The next prime is 66660000697. The reversal of 66660000613 is 31600006666.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51040750084 + 15619250529 = 225922^2 + 124977^2 .

It is a cyclic number.

It is not a de Polignac number, because 66660000613 - 2¹ = 66660000611 is a prime.

Together with 66660000611, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66660000611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33330000306 + 33330000307.

It is an arithmetic number, because the mean of its divisors is an integer number (33330000307).

Almost surely, 2^66660000613 is an apocalyptic number.

It is an amenable number.

66660000613 is a deficient number, since it is larger than the sum of its proper divisors (1).

66660000613 is an equidigital number, since it uses as much as digits as its factorization.

66660000613 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 34.

The spelling of 66660000613 in words is "sixty-six billion, six hundred sixty million, six hundred thirteen", and thus it is an aban number.