666459 has 6 divisors (see below), whose sum is σ = 962676. Its totient is φ = 444300.

The previous prime is 666439. The next prime is 666461. The reversal of 666459 is 954666.

It is a happy number.

It is not a de Polignac number, because 666459 - 2⁵ = 666427 is a prime.

It is not an unprimeable number, because it can be changed into a prime (666439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37017 + ... + 37034.

It is an arithmetic number, because the mean of its divisors is an integer number (160446).

2⁶⁶⁶⁴⁵⁹ is an apocalyptic number.

666459 is a deficient number, since it is larger than the sum of its proper divisors (296217).

666459 is a wasteful number, since it uses less digits than its factorization.

666459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74057 (or 74054 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 666459 is about 816.3694016804. The cubic root of 666459 is about 87.3489748545.

The spelling of 666459 in words is "six hundred sixty-six thousand, four hundred fifty-nine".