686685513 has 8 divisors (see below), whose sum is σ = 915833728. Its totient is φ = 457663824.

The previous prime is 686685499. The next prime is 686685521. The reversal of 686685513 is 315586686.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 686685513 - 2⁴ = 686685497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (686685313) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18145 + ... + 41262.

It is an arithmetic number, because the mean of its divisors is an integer number (114479216).

Almost surely, 2^686685513 is an apocalyptic number.

It is an amenable number.

686685513 is a deficient number, since it is larger than the sum of its proper divisors (229148215).

686685513 is a wasteful number, since it uses less digits than its factorization.

686685513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63263.

The product of its digits is 1036800, while the sum is 48.

The square root of 686685513 is about 26204.6849437271. The cubic root of 686685513 is about 882.2384100030.

The spelling of 686685513 in words is "six hundred eighty-six million, six hundred eighty-five thousand, five hundred thirteen".