686807406511 has 4 divisors (see below), whose sum is σ = 686817591912. Its totient is φ = 686797221112.

The previous prime is 686807406479. The next prime is 686807406539. The reversal of 686807406511 is 115604708686.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 686807406511 - 2⁵ = 686807406479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686807406811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4990876 + ... + 5126641.

It is an arithmetic number, because the mean of its divisors is an integer number (171704397978).

Almost surely, 2^686807406511 is an apocalyptic number.

686807406511 is a deficient number, since it is larger than the sum of its proper divisors (10185401).

686807406511 is a wasteful number, since it uses less digits than its factorization.

686807406511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10185400.

The product of its (nonzero) digits is 1935360, while the sum is 52.

The spelling of 686807406511 in words is "six hundred eighty-six billion, eight hundred seven million, four hundred six thousand, five hundred eleven".