6720841618 has 8 divisors (see below), whose sum is σ = 10115670348. Its totient is φ = 3348951504.

The previous prime is 6720841613. The next prime is 6720841639. The reversal of 6720841618 is 8161480276.

It can be written as a sum of positive squares in 2 ways, for example, as 6720228529 + 613089 = 81977^2 + 783^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (6720841613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5733921 + ... + 5735092.

Almost surely, 2^6720841618 is an apocalyptic number.

6720841618 is a deficient number, since it is larger than the sum of its proper divisors (3394828730).

6720841618 is a wasteful number, since it uses less digits than its factorization.

6720841618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11469308.

The product of its (nonzero) digits is 129024, while the sum is 43.

The square root of 6720841618 is about 81980.7393111333. The cubic root of 6720841618 is about 1887.1563685240.

The spelling of 6720841618 in words is "six billion, seven hundred twenty million, eight hundred forty-one thousand, six hundred eighteen".