161193107161 has 2 divisors, whose sum is σ = 161193107162. Its totient is φ = 161193107160.

The previous prime is 161193107129. The next prime is 161193107197. The reversal of 161193107161 is 161701391161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118780176025 + 42412931136 = 344645^2 + 205944^2 .

It is a cyclic number.

It is not a de Polignac number, because 161193107161 - 2⁵ = 161193107129 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161193107161.

It is not a weakly prime, because it can be changed into another prime (161193107111) 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, 80596553580 + 80596553581.

It is an arithmetic number, because the mean of its divisors is an integer number (80596553581).

Almost surely, 2^161193107161 is an apocalyptic number.

It is an amenable number.

161193107161 is a deficient number, since it is larger than the sum of its proper divisors (1).

161193107161 is an equidigital number, since it uses as much as digits as its factorization.

161193107161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6804, while the sum is 37.

The spelling of 161193107161 in words is "one hundred sixty-one billion, one hundred ninety-three million, one hundred seven thousand, one hundred sixty-one".