66129693529 has 2 divisors, whose sum is σ = 66129693530. Its totient is φ = 66129693528.

The previous prime is 66129693527. The next prime is 66129693559. The reversal of 66129693529 is 92539692166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43036332304 + 23093361225 = 207452^2 + 151965^2 .

It is a cyclic number.

It is not a de Polignac number, because 66129693529 - 2¹ = 66129693527 is a prime.

Together with 66129693527, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (66129693527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33064846764 + 33064846765.

It is an arithmetic number, because the mean of its divisors is an integer number (33064846765).

Almost surely, 2^66129693529 is an apocalyptic number.

It is an amenable number.

66129693529 is a deficient number, since it is larger than the sum of its proper divisors (1).

66129693529 is an equidigital number, since it uses as much as digits as its factorization.

66129693529 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9447840, while the sum is 58.

The spelling of 66129693529 in words is "sixty-six billion, one hundred twenty-nine million, six hundred ninety-three thousand, five hundred twenty-nine".