165491585 has 16 divisors (see below), whose sum is σ = 227183616. Its totient is φ = 113368128.

The previous prime is 165491581. The next prime is 165491591. The reversal of 165491585 is 585194561.

165491585 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 165491585 - 2² = 165491581 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 (165491581) 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, 50672 + ... + 53838.

It is an arithmetic number, because the mean of its divisors is an integer number (14198976).

Almost surely, 2^165491585 is an apocalyptic number.

It is an amenable number.

165491585 is a deficient number, since it is larger than the sum of its proper divisors (61692031).

165491585 is a wasteful number, since it uses less digits than its factorization.

165491585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4672.

The product of its digits is 216000, while the sum is 44.

The square root of 165491585 is about 12864.3532678483. The cubic root of 165491585 is about 549.0248118907.

It can be divided in two parts, 1654 and 91585, that added together give a palindrome (93239).

The spelling of 165491585 in words is "one hundred sixty-five million, four hundred ninety-one thousand, five hundred eighty-five".