6686866 has 4 divisors (see below), whose sum is σ = 10030302. Its totient is φ = 3343432.

The previous prime is 6686861. The next prime is 6686893.

6686866 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 3500641 + 3186225 = 1871^2 + 1785^2 .

It is not an unprimeable number, because it can be changed into a prime (6686861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1671715 + ... + 1671718.

Almost surely, 2^6686866 is an apocalyptic number.

6686866 is a deficient number, since it is larger than the sum of its proper divisors (3343436).

6686866 is a wasteful number, since it uses less digits than its factorization.

6686866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3343435.

The product of its digits is 497664, while the sum is 46.

The square root of 6686866 is about 2585.8975231049. The cubic root of 6686866 is about 188.3970971255.

The spelling of 6686866 in words is "six million, six hundred eighty-six thousand, eight hundred sixty-six".