66684237029 has 2 divisors, whose sum is σ = 66684237030. Its totient is φ = 66684237028.

The previous prime is 66684236999. The next prime is 66684237089. The reversal of 66684237029 is 92073248666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65945212804 + 739024225 = 256798^2 + 27185^2 .

It is a cyclic number.

It is not a de Polignac number, because 66684237029 - 2¹² = 66684232933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66684237089) 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, 33342118514 + 33342118515.

It is an arithmetic number, because the mean of its divisors is an integer number (33342118515).

Almost surely, 2^66684237029 is an apocalyptic number.

It is an amenable number.

66684237029 is a deficient number, since it is larger than the sum of its proper divisors (1).

66684237029 is an equidigital number, since it uses as much as digits as its factorization.

66684237029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5225472, while the sum is 53.

The spelling of 66684237029 in words is "sixty-six billion, six hundred eighty-four million, two hundred thirty-seven thousand, twenty-nine".