6642327618 has 64 divisors (see below), whose sum is σ = 15649096320. Its totient is φ = 2081189376.

The previous prime is 6642327613. The next prime is 6642327689. The reversal of 6642327618 is 8167232466.

6642327618 is a `hidden beast` number, since 6 + 6 + 4 + 2 + 3 + 27 + 618 = 666.

It is not an unprimeable number, because it can be changed into a prime (6642327613) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 782505 + ... + 790947.

It is an arithmetic number, because the mean of its divisors is an integer number (244517130).

Almost surely, 2^6642327618 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6642327618, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7824548160).

6642327618 is an abundant number, since it is smaller than the sum of its proper divisors (9006768702).

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

6642327618 is a wasteful number, since it uses less digits than its factorization.

6642327618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9328 (or 9322 counting only the distinct ones).

The product of its digits is 580608, while the sum is 45.

The square root of 6642327618 is about 81500.4761826580. The cubic root of 6642327618 is about 1879.7788726262.

The spelling of 6642327618 in words is "six billion, six hundred forty-two million, three hundred twenty-seven thousand, six hundred eighteen".