165580123 has 2 divisors, whose sum is σ = 165580124.
Its totient is φ = 165580122.
The previous prime is 165580097. The next prime is 165580147. The reversal of 165580123 is 321085561.
It is a strong prime.
It is a cyclic number.
It is not a de Polignac number, because 165580123 - 25 = 165580091 is a prime.
It is not a weakly prime, because it can be changed into another prime (165580183) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (17) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82790061 + 82790062.
It is an arithmetic number, because the mean of its divisors is an integer number (82790062).
Almost surely, 2165580123 is an apocalyptic number.
165580123 is a deficient number, since it is larger than the sum of its proper divisors (1).
165580123 is an equidigital number, since it uses as much as digits as its factorization.
165580123 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 7200, while the sum is 31.
The square root of 165580123 is about 12867.7940222868.
The cubic root of 165580123 is about 549.1227038624.
The spelling of 165580123 in words is "one hundred sixty-five million, five hundred eighty thousand, one hundred twenty-three".