686786318817 has 16 divisors (see below), whose sum is σ = 922457539200. Its totient is φ = 454490784000.

The previous prime is 686786318773. The next prime is 686786318831. The reversal of 686786318817 is 718813687686.

It is not a de Polignac number, because 686786318817 - 2¹⁹ = 686785794529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (686786318017) 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, 59559 + ... + 1173507.

It is an arithmetic number, because the mean of its divisors is an integer number (57653596200).

Almost surely, 2^686786318817 is an apocalyptic number.

It is an amenable number.

686786318817 is a deficient number, since it is larger than the sum of its proper divisors (235671220383).

686786318817 is a wasteful number, since it uses less digits than its factorization.

686786318817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1115464.

The product of its digits is 130056192, while the sum is 69.

The spelling of 686786318817 in words is "six hundred eighty-six billion, seven hundred eighty-six million, three hundred eighteen thousand, eight hundred seventeen".