6686618 has 4 divisors (see below), whose sum is σ = 10029930. Its totient is φ = 3343308.

The previous prime is 6686611. The next prime is 6686653. The reversal of 6686618 is 8166866.

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., 6568969 + 117649 = 2563^2 + 343^2 .

It is not an unprimeable number, because it can be changed into a prime (6686611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1671653 + ... + 1671656.

Almost surely, 2^6686618 is an apocalyptic number.

6686618 is a deficient number, since it is larger than the sum of its proper divisors (3343312).

6686618 is a wasteful number, since it uses less digits than its factorization.

6686618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3343311.

The product of its digits is 82944, while the sum is 41.

The square root of 6686618 is about 2585.8495702573. The cubic root of 6686618 is about 188.3947680295.

The spelling of 6686618 in words is "six million, six hundred eighty-six thousand, six hundred eighteen".