765126720650161 has 2 divisors, whose sum is σ = 765126720650162. Its totient is φ = 765126720650160.

The previous prime is 765126720650099. The next prime is 765126720650203. The reversal of 765126720650161 is 161056027621567.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 722071063104400 + 43055657545761 = 26871380^2 + 6561681^2 .

It is a cyclic number.

It is not a de Polignac number, because 765126720650161 - 2³⁵ = 765092360911793 is a prime.

It is not a weakly prime, because it can be changed into another prime (765126720690161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 382563360325080 + 382563360325081.

It is an arithmetic number, because the mean of its divisors is an integer number (382563360325081).

Almost surely, 2^{765126720650161} is an apocalyptic number.

It is an amenable number.

765126720650161 is a deficient number, since it is larger than the sum of its proper divisors (1).

765126720650161 is an equidigital number, since it uses as much as digits as its factorization.

765126720650161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6350400, while the sum is 55.

The spelling of 765126720650161 in words is "seven hundred sixty-five trillion, one hundred twenty-six billion, seven hundred twenty million, six hundred fifty thousand, one hundred sixty-one".