666435459 has 4 divisors (see below), whose sum is σ = 888580616. Its totient is φ = 444290304.

The previous prime is 666435439. The next prime is 666435491. The reversal of 666435459 is 954534666.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 666435459 - 2⁹ = 666434947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666435439) 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 in 3 ways as a sum of consecutive naturals, for example, 111072574 + ... + 111072579.

It is an arithmetic number, because the mean of its divisors is an integer number (222145154).

Almost surely, 2^666435459 is an apocalyptic number.

666435459 is a deficient number, since it is larger than the sum of its proper divisors (222145157).

666435459 is a wasteful number, since it uses less digits than its factorization.

666435459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222145156.

The product of its digits is 2332800, while the sum is 48.

The square root of 666435459 is about 25815.4112692399. The cubic root of 666435459 is about 873.4794638089.

The spelling of 666435459 in words is "six hundred sixty-six million, four hundred thirty-five thousand, four hundred fifty-nine".