686838432991471 has 16 divisors (see below), whose sum is σ = 707820782917248. Its totient is φ = 666061110086400.

The previous prime is 686838432991439. The next prime is 686838432991523. The reversal of 686838432991471 is 174199234838686.

It is a cyclic number.

It is not a de Polignac number, because 686838432991471 - 2⁵ = 686838432991439 is a prime.

It is a super-3 number, since 3×686838432991471³ (a number of 45 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 686838432991391 and 686838432991400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686838436991471) 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, 7122216 + ... + 37741261.

It is an arithmetic number, because the mean of its divisors is an integer number (44238798932328).

Almost surely, 2^{686838432991471} is an apocalyptic number.

686838432991471 is a deficient number, since it is larger than the sum of its proper divisors (20982349925777).

686838432991471 is a wasteful number, since it uses less digits than its factorization.

686838432991471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44865762.

The product of its digits is 3009871872, while the sum is 79.

The spelling of 686838432991471 in words is "six hundred eighty-six trillion, eight hundred thirty-eight billion, four hundred thirty-two million, nine hundred ninety-one thousand, four hundred seventy-one".