128309668073 has 2 divisors, whose sum is σ = 128309668074. Its totient is φ = 128309668072.

The previous prime is 128309668063. The next prime is 128309668103. The reversal of 128309668073 is 370866903821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71849730304 + 56459937769 = 268048^2 + 237613^2 .

It is a cyclic number.

It is not a de Polignac number, because 128309668073 - 2⁴ = 128309668057 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (128309668063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64154834036 + 64154834037.

It is an arithmetic number, because the mean of its divisors is an integer number (64154834037).

Almost surely, 2^128309668073 is an apocalyptic number.

It is an amenable number.

128309668073 is a deficient number, since it is larger than the sum of its proper divisors (1).

128309668073 is an equidigital number, since it uses as much as digits as its factorization.

128309668073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2612736, while the sum is 53.

The spelling of 128309668073 in words is "one hundred twenty-eight billion, three hundred nine million, six hundred sixty-eight thousand, seventy-three".