165747 has 4 divisors (see below), whose sum is σ = 221000. Its totient is φ = 110496.

The previous prime is 165721. The next prime is 165749. The reversal of 165747 is 747561.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 747561 = 3 ⋅249187.

It is a de Polignac number, because none of the positive numbers 2^k-165747 is a prime.

It is a D-number.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 165747.

It is not an unprimeable number, because it can be changed into a prime (165749) 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, 27622 + ... + 27627.

It is an arithmetic number, because the mean of its divisors is an integer number (55250).

2¹⁶⁵⁷⁴⁷ is an apocalyptic number.

165747 is a deficient number, since it is larger than the sum of its proper divisors (55253).

165747 is an equidigital number, since it uses as much as digits as its factorization.

165747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55252.

The product of its digits is 5880, while the sum is 30.

The square root of 165747 is about 407.1203753191. The cubic root of 165747 is about 54.9307116461.

The spelling of 165747 in words is "one hundred sixty-five thousand, seven hundred forty-seven".