161565560567 has 4 divisors (see below), whose sum is σ = 164214176376. Its totient is φ = 158916944760.

The previous prime is 161565560521. The next prime is 161565560609. The reversal of 161565560567 is 765065565161.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 161565560567 - 2⁶ = 161565560503 is a prime.

It is a super-2 number, since 2×161565560567² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161565560867) 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 in 3 ways as a sum of consecutive naturals, for example, 1324307813 + ... + 1324307934.

It is an arithmetic number, because the mean of its divisors is an integer number (41053544094).

Almost surely, 2^161565560567 is an apocalyptic number.

161565560567 is a deficient number, since it is larger than the sum of its proper divisors (2648615809).

161565560567 is an equidigital number, since it uses as much as digits as its factorization.

161565560567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2648615808.

The product of its (nonzero) digits is 5670000, while the sum is 53.

The spelling of 161565560567 in words is "one hundred sixty-one billion, five hundred sixty-five million, five hundred sixty thousand, five hundred sixty-seven".