686345571 has 6 divisors (see below), whose sum is σ = 991388060. Its totient is φ = 457563708.

The previous prime is 686345563. The next prime is 686345603. The reversal of 686345571 is 175543686.

686345571 is a `hidden beast` number, since 6 + 8 + 634 + 5 + 5 + 7 + 1 = 666.

686345571 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 686345571 - 2³ = 686345563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (686345551) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 38130301 + ... + 38130318.

Almost surely, 2^686345571 is an apocalyptic number.

686345571 is a deficient number, since it is larger than the sum of its proper divisors (305042489).

686345571 is a wasteful number, since it uses less digits than its factorization.

686345571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76260625 (or 76260622 counting only the distinct ones).

The product of its digits is 604800, while the sum is 45.

The square root of 686345571 is about 26198.1978578680. The cubic root of 686345571 is about 882.0928026435.

The spelling of 686345571 in words is "six hundred eighty-six million, three hundred forty-five thousand, five hundred seventy-one".