6811866388 has 12 divisors (see below), whose sum is σ = 11996695732. Its totient is φ = 3384239040.

The previous prime is 6811866379. The next prime is 6811866409. The reversal of 6811866388 is 8836681186.

It can be written as a sum of positive squares in 2 ways, for example, as 4821635844 + 1990230544 = 69438^2 + 44612^2 .

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 5422833 + ... + 5424088.

Almost surely, 2^6811866388 is an apocalyptic number.

It is an amenable number.

6811866388 is a deficient number, since it is larger than the sum of its proper divisors (5184829344).

6811866388 is a wasteful number, since it uses less digits than its factorization.

6811866388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10847082 (or 10847080 counting only the distinct ones).

The product of its digits is 2654208, while the sum is 55.

The square root of 6811866388 is about 82534.0316960222. The cubic root of 6811866388 is about 1895.6378587098.

The spelling of 6811866388 in words is "six billion, eight hundred eleven million, eight hundred sixty-six thousand, three hundred eighty-eight".