161500566597191 has 2 divisors, whose sum is σ = 161500566597192. Its totient is φ = 161500566597190.

The previous prime is 161500566597067. The next prime is 161500566597259. The reversal of 161500566597191 is 191795665005161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161500566597191 - 2¹⁴ = 161500566580807 is a prime.

It is a super-2 number, since 2×161500566597191² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161500566507191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80750283298595 + 80750283298596.

It is an arithmetic number, because the mean of its divisors is an integer number (80750283298596).

Almost surely, 2^{161500566597191} is an apocalyptic number.

161500566597191 is a deficient number, since it is larger than the sum of its proper divisors (1).

161500566597191 is an equidigital number, since it uses as much as digits as its factorization.

161500566597191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15309000, while the sum is 62.

The spelling of 161500566597191 in words is "one hundred sixty-one trillion, five hundred billion, five hundred sixty-six million, five hundred ninety-seven thousand, one hundred ninety-one".