165142123 has 2 divisors, whose sum is σ = 165142124. Its totient is φ = 165142122.

The previous prime is 165142111. The next prime is 165142141. The reversal of 165142123 is 321241561.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 165142123 - 2⁹ = 165141611 is a prime.

It is not a weakly prime, because it can be changed into another prime (165142193) 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, 82571061 + 82571062.

It is an arithmetic number, because the mean of its divisors is an integer number (82571062).

Almost surely, 2^165142123 is an apocalyptic number.

165142123 is a deficient number, since it is larger than the sum of its proper divisors (1).

165142123 is an equidigital number, since it uses as much as digits as its factorization.

165142123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 25.

The square root of 165142123 is about 12850.7635181728. The cubic root of 165142123 is about 548.6380882647.

Adding to 165142123 its reverse (321241561), we get a palindrome (486383684).

The spelling of 165142123 in words is "one hundred sixty-five million, one hundred forty-two thousand, one hundred twenty-three".