686864444468686 has 72 divisors (see below), whose sum is σ = 1233771191819712. Its totient is φ = 286237689883200.

The previous prime is 686864444468659. The next prime is 686864444468689.

686864444468686 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 686864444468597 and 686864444468606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686864444468689) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 124102735 + ... + 129519178.

It is an arithmetic number, because the mean of its divisors is an integer number (17135710997496).

Almost surely, 2^{686864444468686} is an apocalyptic number.

686864444468686 is a deficient number, since it is larger than the sum of its proper divisors (546906747351026).

686864444468686 is a wasteful number, since it uses less digits than its factorization.

686864444468686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253622006 (or 253621976 counting only the distinct ones).

The product of its digits is 195689447424, while the sum is 88.

The spelling of 686864444468686 in words is "six hundred eighty-six trillion, eight hundred sixty-four billion, four hundred forty-four million, four hundred sixty-eight thousand, six hundred eighty-six".