6861305866 has 16 divisors (see below), whose sum is σ = 10680468840. Its totient is φ = 3301896640.

The previous prime is 6861305861. The next prime is 6861305903. The reversal of 6861305866 is 6685031686.

It can be written as a sum of positive squares in 4 ways, for example, as 2229822841 + 4631483025 = 47221^2 + 68055^2 .

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 7 ways as a sum of consecutive naturals, for example, 168205 + ... + 204976.

Almost surely, 2^6861305866 is an apocalyptic number.

6861305866 is a deficient number, since it is larger than the sum of its proper divisors (3819162974).

6861305866 is a wasteful number, since it uses less digits than its factorization.

6861305866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373529.

The product of its (nonzero) digits is 1244160, while the sum is 49.

The square root of 6861305866 is about 82832.9998611664. Note that the first 3 decimals coincide. The cubic root of 6861305866 is about 1900.2128908266.

The spelling of 6861305866 in words is "six billion, eight hundred sixty-one million, three hundred five thousand, eight hundred sixty-six".