6685666 has 8 divisors (see below), whose sum is σ = 10799964. Its totient is φ = 3085680.

The previous prime is 6685643. The next prime is 6685667. The reversal of 6685666 is 6665866.

It can be written as a sum of positive squares in 2 ways, for example, as 6610041 + 75625 = 2571^2 + 275^2 .

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

It is not an unprimeable number, because it can be changed into a prime (6685667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128545 + ... + 128596.

Almost surely, 2^6685666 is an apocalyptic number.

6685666 is a deficient number, since it is larger than the sum of its proper divisors (4114298).

6685666 is a wasteful number, since it uses less digits than its factorization.

6685666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257156.

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

The square root of 6685666 is about 2585.6654849381. The cubic root of 6685666 is about 188.3858267714.

The spelling of 6685666 in words is "six million, six hundred eighty-five thousand, six hundred sixty-six".