162665 has 4 divisors (see below), whose sum is σ = 195204. Its totient is φ = 130128.

The previous prime is 162649. The next prime is 162671. The reversal of 162665 is 566261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 566261 = 73 ⋅7757.

It can be written as a sum of positive squares in 2 ways, for example, as 52441 + 110224 = 229^2 + 332^2 .

It is a cyclic number.

It is not a de Polignac number, because 162665 - 2⁴ = 162649 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16262 + ... + 16271.

It is an arithmetic number, because the mean of its divisors is an integer number (48801).

2¹⁶²⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

162665 is a deficient number, since it is larger than the sum of its proper divisors (32539).

162665 is an equidigital number, since it uses as much as digits as its factorization.

162665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32538.

The product of its digits is 2160, while the sum is 26.

The square root of 162665 is about 403.3174928019. The cubic root of 162665 is about 54.5881076310.

The spelling of 162665 in words is "one hundred sixty-two thousand, six hundred sixty-five".