6686894986866 has 48 divisors (see below), whose sum is σ = 15776703259200. Its totient is φ = 2038835492064.

The previous prime is 6686894986823. The next prime is 6686894986897.

6686894986866 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 337099126 + ... + 337118961.

It is an arithmetic number, because the mean of its divisors is an integer number (328681317900).

Almost surely, 2^{6686894986866} is an apocalyptic number.

6686894986866 is an abundant number, since it is smaller than the sum of its proper divisors (9089808272334).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6686894986866 is a wasteful number, since it uses less digits than its factorization.

6686894986866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674218143 (or 674218140 counting only the distinct ones).

The product of its digits is 61917364224, while the sum is 90.

The spelling of 6686894986866 in words is "six trillion, six hundred eighty-six billion, eight hundred ninety-four million, nine hundred eighty-six thousand, eight hundred sixty-six".