161379316577 has 2 divisors, whose sum is σ = 161379316578. Its totient is φ = 161379316576.

The previous prime is 161379316499. The next prime is 161379316589. The reversal of 161379316577 is 775613973161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 157030705441 + 4348611136 = 396271^2 + 65944^2 .

It is an emirp because it is prime and its reverse (775613973161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161379316577 - 2²⁰ = 161378268001 is a prime.

It is not a weakly prime, because it can be changed into another prime (161379316177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80689658288 + 80689658289.

It is an arithmetic number, because the mean of its divisors is an integer number (80689658289).

Almost surely, 2^161379316577 is an apocalyptic number.

It is an amenable number.

161379316577 is a deficient number, since it is larger than the sum of its proper divisors (1).

161379316577 is an equidigital number, since it uses as much as digits as its factorization.

161379316577 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5000940, while the sum is 56.

The spelling of 161379316577 in words is "one hundred sixty-one billion, three hundred seventy-nine million, three hundred sixteen thousand, five hundred seventy-seven".