686979949979686 has 24 divisors (see below), whose sum is σ = 1132674358222512. Its totient is φ = 312261113458800.

The previous prime is 686979949979677. The next prime is 686979949979689.

686979949979686 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686979949979689) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19091416 + ... + 41694628.

It is an arithmetic number, because the mean of its divisors is an integer number (47194764925938).

Almost surely, 2^{686979949979686} is an apocalyptic number.

686979949979686 is a deficient number, since it is larger than the sum of its proper divisors (445694408242826).

686979949979686 is a wasteful number, since it uses less digits than its factorization.

686979949979686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22728828 (or 22728817 counting only the distinct ones).

The product of its digits is 8639649091584, while the sum is 112.

The spelling of 686979949979686 in words is "six hundred eighty-six trillion, nine hundred seventy-nine billion, nine hundred forty-nine million, nine hundred seventy-nine thousand, six hundred eighty-six".