6811516618 has 4 divisors (see below), whose sum is σ = 10217274930. Its totient is φ = 3405758308.

The previous prime is 6811516589. The next prime is 6811516619. The reversal of 6811516618 is 8166151186.

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., 4601858569 + 2209658049 = 67837^2 + 47007^2 .

It is not an unprimeable number, because it can be changed into a prime (6811516619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1702879153 + ... + 1702879156.

Almost surely, 2^6811516618 is an apocalyptic number.

6811516618 is a deficient number, since it is larger than the sum of its proper divisors (3405758312).

6811516618 is a wasteful number, since it uses less digits than its factorization.

6811516618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3405758311.

The product of its digits is 69120, while the sum is 43.

The square root of 6811516618 is about 82531.9127247152. The cubic root of 6811516618 is about 1895.6054129470.

The spelling of 6811516618 in words is "six billion, eight hundred eleven million, five hundred sixteen thousand, six hundred eighteen".