6811564867 has 4 divisors (see below), whose sum is σ = 6814002976. Its totient is φ = 6809126760.

The previous prime is 6811564861. The next prime is 6811564871. The reversal of 6811564867 is 7684651186.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6811564867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6811564861) 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 3 ways as a sum of consecutive naturals, for example, 1214859 + ... + 1220452.

It is an arithmetic number, because the mean of its divisors is an integer number (1703500744).

Almost surely, 2^6811564867 is an apocalyptic number.

6811564867 is a deficient number, since it is larger than the sum of its proper divisors (2438109).

6811564867 is a wasteful number, since it uses less digits than its factorization.

6811564867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2438108.

The product of its digits is 1935360, while the sum is 52.

The square root of 6811564867 is about 82532.2050293096. The cubic root of 6811564867 is about 1895.6098887417.

The spelling of 6811564867 in words is "six billion, eight hundred eleven million, five hundred sixty-four thousand, eight hundred sixty-seven".