666403005 has 16 divisors (see below), whose sum is σ = 1068787584. Its totient is φ = 354567360.

The previous prime is 666402991. The next prime is 666403033. The reversal of 666403005 is 500304666.

666403005 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 666403005 - 2⁹ = 666402493 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46449 + ... + 59078.

It is an arithmetic number, because the mean of its divisors is an integer number (66799224).

Almost surely, 2^666403005 is an apocalyptic number.

It is an amenable number.

666403005 is a deficient number, since it is larger than the sum of its proper divisors (402384579).

666403005 is a wasteful number, since it uses less digits than its factorization.

666403005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105956.

The product of its (nonzero) digits is 12960, while the sum is 30.

The square root of 666403005 is about 25814.7826835711. The cubic root of 666403005 is about 873.4652847100.

The spelling of 666403005 in words is "six hundred sixty-six million, four hundred three thousand, five".