66129693559 has 2 divisors, whose sum is σ = 66129693560. Its totient is φ = 66129693558.

The previous prime is 66129693529. The next prime is 66129693571. The reversal of 66129693559 is 95539692166.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66129693559 - 2⁵ = 66129693527 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66129693497 and 66129693506.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66129693529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33064846779 + 33064846780.

It is an arithmetic number, because the mean of its divisors is an integer number (33064846780).

Almost surely, 2^66129693559 is an apocalyptic number.

66129693559 is a deficient number, since it is larger than the sum of its proper divisors (1).

66129693559 is an equidigital number, since it uses as much as digits as its factorization.

66129693559 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23619600, while the sum is 61.

The spelling of 66129693559 in words is "sixty-six billion, one hundred twenty-nine million, six hundred ninety-three thousand, five hundred fifty-nine".