115661165161 has 2 divisors, whose sum is σ = 115661165162. Its totient is φ = 115661165160.

The previous prime is 115661165159. The next prime is 115661165171. The reversal of 115661165161 is 161561166511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 105569757225 + 10091407936 = 324915^2 + 100456^2 .

It is an emirp because it is prime and its reverse (161561166511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 115661165161 - 2¹ = 115661165159 is a prime.

Together with 115661165159, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (115661165141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57830582580 + 57830582581.

It is an arithmetic number, because the mean of its divisors is an integer number (57830582581).

Almost surely, 2^115661165161 is an apocalyptic number.

It is an amenable number.

115661165161 is a deficient number, since it is larger than the sum of its proper divisors (1).

115661165161 is an equidigital number, since it uses as much as digits as its factorization.

115661165161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32400, while the sum is 40.

The spelling of 115661165161 in words is "one hundred fifteen billion, six hundred sixty-one million, one hundred sixty-five thousand, one hundred sixty-one".