165040561 has 8 divisors (see below), whose sum is σ = 189154944. Its totient is φ = 141060480.

The previous prime is 165040543. The next prime is 165040583.

165040561 is nontrivially palindromic in base 10.

165040561 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 a cyclic number.

It is not a de Polignac number, because 165040561 - 2⁹ = 165040049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165040501) 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, 30925 + ... + 35866.

It is an arithmetic number, because the mean of its divisors is an integer number (23644368).

Almost surely, 2^165040561 is an apocalyptic number.

It is an amenable number.

165040561 is a deficient number, since it is larger than the sum of its proper divisors (24114383).

165040561 is an equidigital number, since it uses as much as digits as its factorization.

165040561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67151.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 165040561 is about 12846.8113164318. The cubic root of 165040561 is about 548.5255948416.

The spelling of 165040561 in words is "one hundred sixty-five million, forty thousand, five hundred sixty-one".