165605505605017 has 4 divisors (see below), whose sum is σ = 165606400650240. Its totient is φ = 165604610559796.

The previous prime is 165605505605003. The next prime is 165605505605093. The reversal of 165605505605017 is 710506505506561.

165605505605017 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165605505605017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165605905605017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 447245017 + ... + 447615142.

It is an arithmetic number, because the mean of its divisors is an integer number (41401600162560).

Almost surely, 2^{165605505605017} is an apocalyptic number.

It is an amenable number.

165605505605017 is a deficient number, since it is larger than the sum of its proper divisors (895045223).

165605505605017 is an equidigital number, since it uses as much as digits as its factorization.

165605505605017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 895045222.

The product of its (nonzero) digits is 4725000, while the sum is 52.

The spelling of 165605505605017 in words is "one hundred sixty-five trillion, six hundred five billion, five hundred five million, six hundred five thousand, seventeen".