165653 has 2 divisors, whose sum is σ = 165654. Its totient is φ = 165652.

The previous prime is 165617. The next prime is 165667. The reversal of 165653 is 356561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 165649 + 4 = 407^2 + 2^2 .

It is an emirp because it is prime and its reverse (356561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165653 - 2⁶ = 165589 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82826 + 82827.

It is an arithmetic number, because the mean of its divisors is an integer number (82827).

2¹⁶⁵⁶⁵³ is an apocalyptic number.

It is an amenable number.

165653 is a deficient number, since it is larger than the sum of its proper divisors (1).

165653 is an equidigital number, since it uses as much as digits as its factorization.

165653 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2700, while the sum is 26.

The square root of 165653 is about 407.0049139752. The cubic root of 165653 is about 54.9203254082.

It can be divided in two parts, 165 and 653, that added together give a palindrome (818).

The spelling of 165653 in words is "one hundred sixty-five thousand, six hundred fifty-three".