66829327909 has 2 divisors, whose sum is σ = 66829327910. Its totient is φ = 66829327908.

The previous prime is 66829327891. The next prime is 66829327921. The reversal of 66829327909 is 90972392866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60921099684 + 5908228225 = 246822^2 + 76865^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66829327909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66829327109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33414663954 + 33414663955.

It is an arithmetic number, because the mean of its divisors is an integer number (33414663955).

Almost surely, 2^66829327909 is an apocalyptic number.

It is an amenable number.

66829327909 is a deficient number, since it is larger than the sum of its proper divisors (1).

66829327909 is an equidigital number, since it uses as much as digits as its factorization.

66829327909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17635968, while the sum is 61.

The spelling of 66829327909 in words is "sixty-six billion, eight hundred twenty-nine million, three hundred twenty-seven thousand, nine hundred nine".