161173711262657 has 2 divisors, whose sum is σ = 161173711262658. Its totient is φ = 161173711262656.

The previous prime is 161173711262581. The next prime is 161173711262699. The reversal of 161173711262657 is 756262117371161.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 156273225863041 + 4900485399616 = 12500929^2 + 2213704^2 .

It is a cyclic number.

It is not a de Polignac number, because 161173711262657 - 2⁸ = 161173711262401 is a prime.

It is not a weakly prime, because it can be changed into another prime (161173713262657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80586855631328 + 80586855631329.

It is an arithmetic number, because the mean of its divisors is an integer number (80586855631329).

Almost surely, 2^{161173711262657} is an apocalyptic number.

It is an amenable number.

161173711262657 is a deficient number, since it is larger than the sum of its proper divisors (1).

161173711262657 is an equidigital number, since it uses as much as digits as its factorization.

161173711262657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4445280, while the sum is 56.

The spelling of 161173711262657 in words is "one hundred sixty-one trillion, one hundred seventy-three billion, seven hundred eleven million, two hundred sixty-two thousand, six hundred fifty-seven".