6861305865 has 16 divisors (see below), whose sum is σ = 11013170688. Its totient is φ = 3647669376.

The previous prime is 6861305861. The next prime is 6861305903. The reversal of 6861305865 is 5685031686.

It is not a de Polignac number, because 6861305865 - 2² = 6861305861 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6861305861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 726009 + ... + 735398.

It is an arithmetic number, because the mean of its divisors is an integer number (688323168).

Almost surely, 2^6861305865 is an apocalyptic number.

It is an amenable number.

6861305865 is a deficient number, since it is larger than the sum of its proper divisors (4151864823).

6861305865 is a wasteful number, since it uses less digits than its factorization.

6861305865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1461728.

The product of its (nonzero) digits is 1036800, while the sum is 48.

The square root of 6861305865 is about 82832.9998551302. Note that the first 3 decimals coincide. The cubic root of 6861305865 is about 1900.2128907343.

The spelling of 6861305865 in words is "six billion, eight hundred sixty-one million, three hundred five thousand, eight hundred sixty-five".