765561393419773 has 2 divisors, whose sum is σ = 765561393419774. Its totient is φ = 765561393419772.

The previous prime is 765561393419731. The next prime is 765561393419839. The reversal of 765561393419773 is 377914393165567.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 748557671087524 + 17003722332249 = 27359782^2 + 4123557^2 .

It is a cyclic number.

It is not a de Polignac number, because 765561393419773 - 2³³ = 765552803485181 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 765561393419773.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (765561393419723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 382780696709886 + 382780696709887.

It is an arithmetic number, because the mean of its divisors is an integer number (382780696709887).

Almost surely, 2^{765561393419773} is an apocalyptic number.

It is an amenable number.

765561393419773 is a deficient number, since it is larger than the sum of its proper divisors (1).

765561393419773 is an equidigital number, since it uses as much as digits as its factorization.

765561393419773 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2700507600, while the sum is 76.

The spelling of 765561393419773 in words is "seven hundred sixty-five trillion, five hundred sixty-one billion, three hundred ninety-three million, four hundred nineteen thousand, seven hundred seventy-three".