161600665101091 has 2 divisors, whose sum is σ = 161600665101092. Its totient is φ = 161600665101090.

The previous prime is 161600665100869. The next prime is 161600665101167. The reversal of 161600665101091 is 190101566006161.

161600665101091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (190101566006161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161600665101091 - 2³⁵ = 161566305362723 is a prime.

It is a super-2 number, since 2×161600665101091² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161600665101991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80800332550545 + 80800332550546.

It is an arithmetic number, because the mean of its divisors is an integer number (80800332550546).

Almost surely, 2^{161600665101091} is an apocalyptic number.

161600665101091 is a deficient number, since it is larger than the sum of its proper divisors (1).

161600665101091 is an equidigital number, since it uses as much as digits as its factorization.

161600665101091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 58320, while the sum is 43.

The spelling of 161600665101091 in words is "one hundred sixty-one trillion, six hundred billion, six hundred sixty-five million, one hundred one thousand, ninety-one".