66997130513 has 2 divisors, whose sum is σ = 66997130514. Its totient is φ = 66997130512.

The previous prime is 66997130477. The next prime is 66997130531. The reversal of 66997130513 is 31503179966.

66997130513 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with next prime (66997130531) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65404482049 + 1592648464 = 255743^2 + 39908^2 .

It is a cyclic number.

It is not a de Polignac number, because 66997130513 - 2⁶ = 66997130449 is a prime.

It is not a weakly prime, because it can be changed into another prime (66997130533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33498565256 + 33498565257.

It is an arithmetic number, because the mean of its divisors is an integer number (33498565257).

Almost surely, 2^66997130513 is an apocalyptic number.

It is an amenable number.

66997130513 is a deficient number, since it is larger than the sum of its proper divisors (1).

66997130513 is an equidigital number, since it uses as much as digits as its factorization.

66997130513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 918540, while the sum is 50.

The spelling of 66997130513 in words is "sixty-six billion, nine hundred ninety-seven million, one hundred thirty thousand, five hundred thirteen".