6645618 has 32 divisors (see below), whose sum is σ = 16878720. Its totient is φ = 1898640.

The previous prime is 6645601. The next prime is 6645619. The reversal of 6645618 is 8165466.

6645618 is a `hidden beast` number, since 6 + 645 + 6 + 1 + 8 = 666.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6645619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8413 + ... + 9168.

It is an arithmetic number, because the mean of its divisors is an integer number (527460).

Almost surely, 2^6645618 is an apocalyptic number.

6645618 is an abundant number, since it is smaller than the sum of its proper divisors (10233102).

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

6645618 is a wasteful number, since it uses less digits than its factorization.

6645618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17599 (or 17593 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 6645618 is about 2577.9096182760. The cubic root of 6645618 is about 188.0089214116.

The spelling of 6645618 in words is "six million, six hundred forty-five thousand, six hundred eighteen".