776655161 has 2 divisors, whose sum is σ = 776655162. Its totient is φ = 776655160.

The previous prime is 776655127. The next prime is 776655167. The reversal of 776655161 is 161556677.

776655161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 689587600 + 87067561 = 26260^2 + 9331^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-776655161 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 (776655167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 388327580 + 388327581.

It is an arithmetic number, because the mean of its divisors is an integer number (388327581).

Almost surely, 2^776655161 is an apocalyptic number.

It is an amenable number.

776655161 is a deficient number, since it is larger than the sum of its proper divisors (1).

776655161 is an equidigital number, since it uses as much as digits as its factorization.

776655161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 264600, while the sum is 44.

The square root of 776655161 is about 27868.5335279774. The cubic root of 776655161 is about 919.1987198554.

The spelling of 776655161 in words is "seven hundred seventy-six million, six hundred fifty-five thousand, one hundred sixty-one".