161105165057 has 4 divisors (see below), whose sum is σ = 161105975040. Its totient is φ = 161104355076.

The previous prime is 161105165027. The next prime is 161105165059. The reversal of 161105165057 is 750561501161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 161105165057 - 2¹⁶ = 161105099521 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161105165057.

It is not an unprimeable number, because it can be changed into a prime (161105165059) 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 in 3 ways as a sum of consecutive naturals, for example, 121544 + ... + 580502.

It is an arithmetic number, because the mean of its divisors is an integer number (40276493760).

Almost surely, 2^161105165057 is an apocalyptic number.

It is an amenable number.

161105165057 is a deficient number, since it is larger than the sum of its proper divisors (809983).

161105165057 is an equidigital number, since it uses as much as digits as its factorization.

161105165057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 809982.

The product of its (nonzero) digits is 31500, while the sum is 38.

The spelling of 161105165057 in words is "one hundred sixty-one billion, one hundred five million, one hundred sixty-five thousand, fifty-seven".