6686996866 has 16 divisors (see below), whose sum is σ = 10951248960. Its totient is φ = 3037074480.

The previous prime is 6686996861. The next prime is 6686996879.

6686996866 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 6686996795 and 6686996804.

It is not an unprimeable number, because it can be changed into a prime (6686996861) 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, 95646 + ... + 150073.

It is an arithmetic number, because the mean of its divisors is an integer number (684453060).

Almost surely, 2^6686996866 is an apocalyptic number.

6686996866 is a deficient number, since it is larger than the sum of its proper divisors (4264252094).

6686996866 is a wasteful number, since it uses less digits than its factorization.

6686996866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246969.

The product of its digits is 241864704, while the sum is 70.

The square root of 6686996866 is about 81774.0598600803. The cubic root of 6686996866 is about 1883.9832613238.

The spelling of 6686996866 in words is "six billion, six hundred eighty-six million, nine hundred ninety-six thousand, eight hundred sixty-six".