686606686 has 16 divisors (see below), whose sum is σ = 1094855760. Its totient is φ = 322012800.

The previous prime is 686606681. The next prime is 686606699.

686606686 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686606681) 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, 85611 + ... + 93286.

It is an arithmetic number, because the mean of its divisors is an integer number (68428485).

Almost surely, 2^686606686 is an apocalyptic number.

686606686 is a deficient number, since it is larger than the sum of its proper divisors (408249074).

686606686 is a wasteful number, since it uses less digits than its factorization.

686606686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179019.

The product of its (nonzero) digits is 2985984, while the sum is 52.

The square root of 686606686 is about 26203.1808374480. The cubic root of 686606686 is about 882.2046503139.

The spelling of 686606686 in words is "six hundred eighty-six million, six hundred six thousand, six hundred eighty-six".