165275661 has 8 divisors (see below), whose sum is σ = 231965920. Its totient is φ = 104384592.

The previous prime is 165275639. The next prime is 165275687. The reversal of 165275661 is 166572561.

165275661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 165275661 - 2⁵ = 165275629 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165275261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1449730 + ... + 1449843.

It is an arithmetic number, because the mean of its divisors is an integer number (28995740).

Almost surely, 2^165275661 is an apocalyptic number.

It is an amenable number.

165275661 is a deficient number, since it is larger than the sum of its proper divisors (66690259).

165275661 is a wasteful number, since it uses less digits than its factorization.

165275661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2899595.

The product of its digits is 75600, while the sum is 39.

The square root of 165275661 is about 12855.9581906601. The cubic root of 165275661 is about 548.7859291928.

The spelling of 165275661 in words is "one hundred sixty-five million, two hundred seventy-five thousand, six hundred sixty-one".