772668128724209 has 2 divisors, whose sum is σ = 772668128724210. Its totient is φ = 772668128724208.

The previous prime is 772668128724199. The next prime is 772668128724227. The reversal of 772668128724209 is 902427821866277.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 678455325480625 + 94212803243584 = 26047175^2 + 9706328^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-772668128724209 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 (772668127724209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 386334064362104 + 386334064362105.

It is an arithmetic number, because the mean of its divisors is an integer number (386334064362105).

Almost surely, 2^{772668128724209} is an apocalyptic number.

It is an amenable number.

772668128724209 is a deficient number, since it is larger than the sum of its proper divisors (1).

772668128724209 is an equidigital number, since it uses as much as digits as its factorization.

772668128724209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 455196672, while the sum is 71.

The spelling of 772668128724209 in words is "seven hundred seventy-two trillion, six hundred sixty-eight billion, one hundred twenty-eight million, seven hundred twenty-four thousand, two hundred nine".