6666685 has 8 divisors (see below), whose sum is σ = 8016696. Its totient is φ = 5322240.

The previous prime is 6666683. The next prime is 6666689. The reversal of 6666685 is 5866666.

It can be written as a sum of positive squares in 4 ways, for example, as 41209 + 6625476 = 203^2 + 2574^2 .

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

It is not a de Polignac number, because 6666685 - 2¹ = 6666683 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 (6666683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2005 + ... + 4165.

It is an arithmetic number, because the mean of its divisors is an integer number (1002087).

Almost surely, 2^6666685 is an apocalyptic number.

It is an amenable number.

6666685 is a deficient number, since it is larger than the sum of its proper divisors (1350011).

6666685 is a wasteful number, since it uses less digits than its factorization.

6666685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2783.

The product of its digits is 311040, while the sum is 43.

The square root of 6666685 is about 2581.9924477039. The cubic root of 6666685 is about 188.2073782993.

The spelling of 6666685 in words is "six million, six hundred sixty-six thousand, six hundred eighty-five".