161115050665549 has 2 divisors, whose sum is σ = 161115050665550. Its totient is φ = 161115050665548.

The previous prime is 161115050665529. The next prime is 161115050665553. The reversal of 161115050665549 is 945566050511161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 159583669165449 + 1531381500100 = 12632643^2 + 1237490^2 .

It is a cyclic number.

It is not a de Polignac number, because 161115050665549 - 2²⁵ = 161115017111117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161115050665549.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161115050665529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80557525332774 + 80557525332775.

It is an arithmetic number, because the mean of its divisors is an integer number (80557525332775).

Almost surely, 2^{161115050665549} is an apocalyptic number.

It is an amenable number.

161115050665549 is a deficient number, since it is larger than the sum of its proper divisors (1).

161115050665549 is an equidigital number, since it uses as much as digits as its factorization.

161115050665549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4860000, while the sum is 55.

The spelling of 161115050665549 in words is "one hundred sixty-one trillion, one hundred fifteen billion, fifty million, six hundred sixty-five thousand, five hundred forty-nine".