163104776561 has 2 divisors, whose sum is σ = 163104776562. Its totient is φ = 163104776560.

The previous prime is 163104776509. The next prime is 163104776581. The reversal of 163104776561 is 165677401361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 140415078400 + 22689698161 = 374720^2 + 150631^2 .

It is an emirp because it is prime and its reverse (165677401361) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-163104776561 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 (163104776501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81552388280 + 81552388281.

It is an arithmetic number, because the mean of its divisors is an integer number (81552388281).

Almost surely, 2^163104776561 is an apocalyptic number.

It is an amenable number.

163104776561 is a deficient number, since it is larger than the sum of its proper divisors (1).

163104776561 is an equidigital number, since it uses as much as digits as its factorization.

163104776561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 635040, while the sum is 47.

The spelling of 163104776561 in words is "one hundred sixty-three billion, one hundred four million, seven hundred seventy-six thousand, five hundred sixty-one".