165799 has 2 divisors, whose sum is σ = 165800. Its totient is φ = 165798.

The previous prime is 165779. The next prime is 165811. The reversal of 165799 is 997561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 165799 - 2⁹ = 165287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82899 + 82900.

It is an arithmetic number, because the mean of its divisors is an integer number (82900).

2¹⁶⁵⁷⁹⁹ is an apocalyptic number.

165799 is a deficient number, since it is larger than the sum of its proper divisors (1).

165799 is an equidigital number, since it uses as much as digits as its factorization.

165799 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17010, while the sum is 37.

The square root of 165799 is about 407.1842334865. The cubic root of 165799 is about 54.9364555376.

The spelling of 165799 in words is "one hundred sixty-five thousand, seven hundred ninety-nine".