686121686 has 8 divisors (see below), whose sum is σ = 1029463344. Its totient is φ = 342967240.

The previous prime is 686121661. The next prime is 686121707.

686121686 is nontrivially palindromic in base 10.

686121686 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37250 + ... + 52533.

It is an arithmetic number, because the mean of its divisors is an integer number (128682918).

Almost surely, 2^686121686 is an apocalyptic number.

686121686 is a deficient number, since it is larger than the sum of its proper divisors (343341658).

686121686 is a wasteful number, since it uses less digits than its factorization.

686121686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93606.

The product of its digits is 165888, while the sum is 44.

The square root of 686121686 is about 26193.9246009452. The cubic root of 686121686 is about 881.9968797184.

The spelling of 686121686 in words is "six hundred eighty-six million, one hundred twenty-one thousand, six hundred eighty-six".