165508223 has 2 divisors, whose sum is σ = 165508224. Its totient is φ = 165508222.

The previous prime is 165508199. The next prime is 165508237. The reversal of 165508223 is 322805561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 165508223 - 2¹⁴ = 165491839 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 165508223.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165501223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82754111 + 82754112.

It is an arithmetic number, because the mean of its divisors is an integer number (82754112).

Almost surely, 2^165508223 is an apocalyptic number.

165508223 is a deficient number, since it is larger than the sum of its proper divisors (1).

165508223 is an equidigital number, since it uses as much as digits as its factorization.

165508223 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 165508223 is about 12864.9999222697. Note that the first 4 decimals coincide. The cubic root of 165508223 is about 549.0432103463.

The spelling of 165508223 in words is "one hundred sixty-five million, five hundred eight thousand, two hundred twenty-three".