165523 has 2 divisors, whose sum is σ = 165524. Its totient is φ = 165522.

The previous prime is 165511. The next prime is 165527. The reversal of 165523 is 325561.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165523 is a prime.

165523 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 165494 and 165503.

It is not a weakly prime, because it can be changed into another prime (165527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82761 + 82762.

It is an arithmetic number, because the mean of its divisors is an integer number (82762).

2¹⁶⁵⁵²³ is an apocalyptic number.

165523 is a deficient number, since it is larger than the sum of its proper divisors (1).

165523 is an equidigital number, since it uses as much as digits as its factorization.

165523 is an evil number, because the sum of its binary digits is even.

The product of its digits is 900, while the sum is 22.

The square root of 165523 is about 406.8451793987. The cubic root of 165523 is about 54.9059549857.

The spelling of 165523 in words is "one hundred sixty-five thousand, five hundred twenty-three".