686749258271 has 4 divisors (see below), whose sum is σ = 686770027200. Its totient is φ = 686728489344.

The previous prime is 686749258259. The next prime is 686749258277. The reversal of 686749258271 is 172852947686.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 172852947686 = 2 ⋅86426473843.

It is a cyclic number.

It is not a de Polignac number, because 686749258271 - 2⁶ = 686749258207 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 686749258198 and 686749258207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686749258277) 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, 10334786 + ... + 10401023.

It is an arithmetic number, because the mean of its divisors is an integer number (171692506800).

Almost surely, 2^686749258271 is an apocalyptic number.

686749258271 is a deficient number, since it is larger than the sum of its proper divisors (20768929).

686749258271 is a wasteful number, since it uses less digits than its factorization.

686749258271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20768928.

The product of its digits is 81285120, while the sum is 65.

The spelling of 686749258271 in words is "six hundred eighty-six billion, seven hundred forty-nine million, two hundred fifty-eight thousand, two hundred seventy-one".