686171268771 has 4 divisors (see below), whose sum is σ = 914895025032. Its totient is φ = 457447512512.

The previous prime is 686171268751. The next prime is 686171268779. The reversal of 686171268771 is 177862171686.

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 686171268771 - 2⁶ = 686171268707 is a prime.

It is not an unprimeable number, because it can be changed into a prime (686171268779) 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, 114361878126 + ... + 114361878131.

It is an arithmetic number, because the mean of its divisors is an integer number (228723756258).

Almost surely, 2^686171268771 is an apocalyptic number.

686171268771 is a deficient number, since it is larger than the sum of its proper divisors (228723756261).

686171268771 is a wasteful number, since it uses less digits than its factorization.

686171268771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228723756260.

The product of its digits is 9483264, while the sum is 60.

The spelling of 686171268771 in words is "six hundred eighty-six billion, one hundred seventy-one million, two hundred sixty-eight thousand, seven hundred seventy-one".