6666618 has 32 divisors (see below), whose sum is σ = 16136064. Its totient is φ = 1792512.

The previous prime is 6666617. The next prime is 6666679. The reversal of 6666618 is 8166666.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (6666613) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3955 + ... + 5382.

It is an arithmetic number, because the mean of its divisors is an integer number (504252).

Almost surely, 2^6666618 is an apocalyptic number.

6666618 is an abundant number, since it is smaller than the sum of its proper divisors (9469446).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6666618 is a wasteful number, since it uses less digits than its factorization.

6666618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9366.

The product of its digits is 62208, while the sum is 39.

The square root of 6666618 is about 2581.9794731949. The cubic root of 6666618 is about 188.2067478042.

The spelling of 6666618 in words is "six million, six hundred sixty-six thousand, six hundred eighteen".