6666005 has 8 divisors (see below), whose sum is σ = 8029752. Its totient is φ = 5312448.

The previous prime is 6666001. The next prime is 6666029. The reversal of 6666005 is 5006666.

It can be written as a sum of positive squares in 4 ways, for example, as 485809 + 6180196 = 697^2 + 2486^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 6666005 - 2² = 6666001 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6666001) 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 in 7 ways as a sum of consecutive naturals, for example, 1022 + ... + 3791.

It is an arithmetic number, because the mean of its divisors is an integer number (1003719).

Almost surely, 2^6666005 is an apocalyptic number.

It is an amenable number.

6666005 is a deficient number, since it is larger than the sum of its proper divisors (1363747).

6666005 is a wasteful number, since it uses less digits than its factorization.

6666005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5095.

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

The square root of 6666005 is about 2581.8607630932. The cubic root of 6666005 is about 188.2009790485.

The spelling of 6666005 in words is "six million, six hundred sixty-six thousand, five".