666605005 has 8 divisors (see below), whose sum is σ = 872646624. Its totient is φ = 484803600.

The previous prime is 666604973. The next prime is 666605029. The reversal of 666605005 is 500506666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 666605005 - 2⁵ = 666604973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 6059991 + ... + 6060100.

It is an arithmetic number, because the mean of its divisors is an integer number (109080828).

Almost surely, 2^666605005 is an apocalyptic number.

It is an amenable number.

666605005 is a deficient number, since it is larger than the sum of its proper divisors (206041619).

666605005 is a wasteful number, since it uses less digits than its factorization.

666605005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12120107.

The product of its (nonzero) digits is 32400, while the sum is 34.

The square root of 666605005 is about 25818.6948740636. The cubic root of 666605005 is about 873.5535306922.

The spelling of 666605005 in words is "six hundred sixty-six million, six hundred five thousand, five".