165571120265 has 16 divisors (see below), whose sum is σ = 199836104832. Its totient is φ = 131691335424.

The previous prime is 165571120261. The next prime is 165571120279. The reversal of 165571120265 is 562021175561.

It is a cyclic number.

It is not a de Polignac number, because 165571120265 - 2² = 165571120261 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (165571120261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 724817 + ... + 925473.

It is an arithmetic number, because the mean of its divisors is an integer number (12489756552).

Almost surely, 2^165571120265 is an apocalyptic number.

It is an amenable number.

165571120265 is a deficient number, since it is larger than the sum of its proper divisors (34264984567).

165571120265 is a wasteful number, since it uses less digits than its factorization.

165571120265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201616.

The product of its (nonzero) digits is 126000, while the sum is 41.

The spelling of 165571120265 in words is "one hundred sixty-five billion, five hundred seventy-one million, one hundred twenty thousand, two hundred sixty-five".