161606055000161 has 2 divisors, whose sum is σ = 161606055000162. Its totient is φ = 161606055000160.

The previous prime is 161606055000113. The next prime is 161606055000239. The reversal of 161606055000161 is 161000550606161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 100756304609536 + 60849750390625 = 10037744^2 + 7800625^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161606055000161 is a prime.

It is a super-2 number, since 2×161606055000161² (a number of 29 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (161606055000101) 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, 80803027500080 + 80803027500081.

It is an arithmetic number, because the mean of its divisors is an integer number (80803027500081).

Almost surely, 2^{161606055000161} is an apocalyptic number.

It is an amenable number.

161606055000161 is a deficient number, since it is larger than the sum of its proper divisors (1).

161606055000161 is an equidigital number, since it uses as much as digits as its factorization.

161606055000161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32400, while the sum is 38.

The spelling of 161606055000161 in words is "one hundred sixty-one trillion, six hundred six billion, fifty-five million, one hundred sixty-one", and thus it is an aban number.