161611165011089 has 2 divisors, whose sum is σ = 161611165011090. Its totient is φ = 161611165011088.

The previous prime is 161611165011041. The next prime is 161611165011119. The reversal of 161611165011089 is 980110561116161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82511788960000 + 79099376051089 = 9083600^2 + 8893783^2 .

It is an emirp because it is prime and its reverse (980110561116161) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161611165011089 is a prime.

It is a super-2 number, since 2×161611165011089² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161611165011019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80805582505544 + 80805582505545.

It is an arithmetic number, because the mean of its divisors is an integer number (80805582505545).

Almost surely, 2^{161611165011089} is an apocalyptic number.

It is an amenable number.

161611165011089 is a deficient number, since it is larger than the sum of its proper divisors (1).

161611165011089 is an equidigital number, since it uses as much as digits as its factorization.

161611165011089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 47.

The spelling of 161611165011089 in words is "one hundred sixty-one trillion, six hundred eleven billion, one hundred sixty-five million, eleven thousand, eighty-nine".