6665123 has 2 divisors, whose sum is σ = 6665124. Its totient is φ = 6665122.

The previous prime is 6665111. The next prime is 6665159. The reversal of 6665123 is 3215666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6665123 - 2⁶ = 6665059 is a prime.

It is not a weakly prime, because it can be changed into another prime (6665623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3332561 + 3332562.

It is an arithmetic number, because the mean of its divisors is an integer number (3332562).

Almost surely, 2^6665123 is an apocalyptic number.

6665123 is a deficient number, since it is larger than the sum of its proper divisors (1).

6665123 is an equidigital number, since it uses as much as digits as its factorization.

6665123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 29.

The square root of 6665123 is about 2581.6899504007. The cubic root of 6665123 is about 188.1926781954.

The spelling of 6665123 in words is "six million, six hundred sixty-five thousand, one hundred twenty-three".