165511 has 2 divisors, whose sum is σ = 165512. Its totient is φ = 165510.

The previous prime is 165479. The next prime is 165523. The reversal of 165511 is 115561.

It is a strong prime.

It is an emirp because it is prime and its reverse (115561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165511 - 2⁵ = 165479 is a prime.

It is a super-2 number, since 2×165511² = 54787782242, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82755 + 82756.

It is an arithmetic number, because the mean of its divisors is an integer number (82756).

2¹⁶⁵⁵¹¹ is an apocalyptic number.

165511 is a deficient number, since it is larger than the sum of its proper divisors (1).

165511 is an equidigital number, since it uses as much as digits as its factorization.

165511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 150, while the sum is 19.

The square root of 165511 is about 406.8304315068. The cubic root of 165511 is about 54.9046281059.

It can be divided in two parts, 165 and 511, that added together give a palindrome (676).

The spelling of 165511 in words is "one hundred sixty-five thousand, five hundred eleven".