6686464646866 has 8 divisors (see below), whose sum is σ = 10129000901004. Its totient is φ = 3310131013200.

The previous prime is 6686464646863. The next prime is 6686464646887.

It is a happy number.

6686464646866 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 6238530267025 + 447934379841 = 2497705^2 + 669279^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 6686464646792 and 6686464646801.

It is not an unprimeable number, because it can be changed into a prime (6686464646863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16550654865 + ... + 16550655268.

Almost surely, 2^{6686464646866} is an apocalyptic number.

6686464646866 is a deficient number, since it is larger than the sum of its proper divisors (3442536254138).

6686464646866 is a wasteful number, since it uses less digits than its factorization.

6686464646866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33101310236.

The product of its digits is 6879707136, while the sum is 76.

The spelling of 6686464646866 in words is "six trillion, six hundred eighty-six billion, four hundred sixty-four million, six hundred forty-six thousand, eight hundred sixty-six".