66194705122529 has 2 divisors, whose sum is σ = 66194705122530. Its totient is φ = 66194705122528.

The previous prime is 66194705122501. The next prime is 66194705122627. The reversal of 66194705122529 is 92522150749166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42998537384929 + 23196167737600 = 6557327^2 + 4816240^2 .

It is a cyclic number.

It is not a de Polignac number, because 66194705122529 - 2¹⁶ = 66194705056993 is a prime.

It is not a weakly prime, because it can be changed into another prime (66194765122529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33097352561264 + 33097352561265.

It is an arithmetic number, because the mean of its divisors is an integer number (33097352561265).

Almost surely, 2^{66194705122529} is an apocalyptic number.

It is an amenable number.

66194705122529 is a deficient number, since it is larger than the sum of its proper divisors (1).

66194705122529 is an equidigital number, since it uses as much as digits as its factorization.

66194705122529 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16329600, while the sum is 59.

The spelling of 66194705122529 in words is "sixty-six trillion, one hundred ninety-four billion, seven hundred five million, one hundred twenty-two thousand, five hundred twenty-nine".