6811916561 has 8 divisors (see below), whose sum is σ = 7026850560. Its totient is φ = 6598605168.

The previous prime is 6811916557. The next prime is 6811916593. The reversal of 6811916561 is 1656191186.

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

It is a cyclic number.

It is not a de Polignac number, because 6811916561 - 2² = 6811916557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6811916521) 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 7 ways as a sum of consecutive naturals, for example, 397121 + ... + 413918.

It is an arithmetic number, because the mean of its divisors is an integer number (878356320).

Almost surely, 2^6811916561 is an apocalyptic number.

It is an amenable number.

6811916561 is a deficient number, since it is larger than the sum of its proper divisors (214933999).

6811916561 is a wasteful number, since it uses less digits than its factorization.

6811916561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 811303.

The product of its digits is 77760, while the sum is 44.

The square root of 6811916561 is about 82534.3356488680. The cubic root of 6811916561 is about 1895.6425128236.

The spelling of 6811916561 in words is "six billion, eight hundred eleven million, nine hundred sixteen thousand, five hundred sixty-one".