686661866103813 has 16 divisors (see below), whose sum is σ = 935128939641600. Its totient is φ = 447986768642496.

The previous prime is 686661866103803. The next prime is 686661866103821. The reversal of 686661866103813 is 318301668166686.

It is not a de Polignac number, because 686661866103813 - 2⁶ = 686661866103749 is a prime.

It is a super-3 number, since 3×686661866103813³ (a number of 45 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686661866103803) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 259134370 + ... + 261770787.

It is an arithmetic number, because the mean of its divisors is an integer number (58445558727600).

Almost surely, 2^{686661866103813} is an apocalyptic number.

It is an amenable number.

686661866103813 is a deficient number, since it is larger than the sum of its proper divisors (248467073537787).

686661866103813 is a wasteful number, since it uses less digits than its factorization.

686661866103813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520914556.

The product of its (nonzero) digits is 214990848, while the sum is 69.

The spelling of 686661866103813 in words is "six hundred eighty-six trillion, six hundred sixty-one billion, eight hundred sixty-six million, one hundred three thousand, eight hundred thirteen".