776408161 has 2 divisors, whose sum is σ = 776408162. Its totient is φ = 776408160.

The previous prime is 776408117. The next prime is 776408179. The reversal of 776408161 is 161804677.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 627201936 + 149206225 = 25044^2 + 12215^2 .

It is an emirp because it is prime and its reverse (161804677) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 776408161 - 2¹⁵ = 776375393 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (776400161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 388204080 + 388204081.

It is an arithmetic number, because the mean of its divisors is an integer number (388204081).

Almost surely, 2^776408161 is an apocalyptic number.

It is an amenable number.

776408161 is a deficient number, since it is larger than the sum of its proper divisors (1).

776408161 is an equidigital number, since it uses as much as digits as its factorization.

776408161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 776408161 is about 27864.1016542791. The cubic root of 776408161 is about 919.1012651255.

The spelling of 776408161 in words is "seven hundred seventy-six million, four hundred eight thousand, one hundred sixty-one".