161506016106161 has 2 divisors, whose sum is σ = 161506016106162. Its totient is φ = 161506016106160.

The previous prime is 161506016106151. The next prime is 161506016106179. The reversal of 161506016106161 is 161601610605161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 100186466843761 + 61319549262400 = 10009319^2 + 7830680^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161506016106161 is a prime.

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 (161506016106101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80753008053080 + 80753008053081.

It is an arithmetic number, because the mean of its divisors is an integer number (80753008053081).

Almost surely, 2^{161506016106161} is an apocalyptic number.

It is an amenable number.

161506016106161 is a deficient number, since it is larger than the sum of its proper divisors (1).

161506016106161 is an equidigital number, since it uses as much as digits as its factorization.

161506016106161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 41.

The spelling of 161506016106161 in words is "one hundred sixty-one trillion, five hundred six billion, sixteen million, one hundred six thousand, one hundred sixty-one".