161365521227 has 2 divisors, whose sum is σ = 161365521228. Its totient is φ = 161365521226.

The previous prime is 161365521209. The next prime is 161365521241. The reversal of 161365521227 is 722125563161.

It is a strong prime.

It is an emirp because it is prime and its reverse (722125563161) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161365521227 is a prime.

It is a super-2 number, since 2×161365521227² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161365521827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80682760613 + 80682760614.

It is an arithmetic number, because the mean of its divisors is an integer number (80682760614).

Almost surely, 2^161365521227 is an apocalyptic number.

161365521227 is a deficient number, since it is larger than the sum of its proper divisors (1).

161365521227 is an equidigital number, since it uses as much as digits as its factorization.

161365521227 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 151200, while the sum is 41.

The spelling of 161365521227 in words is "one hundred sixty-one billion, three hundred sixty-five million, five hundred twenty-one thousand, two hundred twenty-seven".