686616923 has 8 divisors (see below), whose sum is σ = 712482816. Its totient is φ = 660983400.

The previous prime is 686616911. The next prime is 686616929. The reversal of 686616923 is 329616686.

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

It is a cyclic number.

It is not a de Polignac number, because 686616923 - 2¹⁰ = 686615899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (686616929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52061 + ... + 63902.

It is an arithmetic number, because the mean of its divisors is an integer number (89060352).

Almost surely, 2^686616923 is an apocalyptic number.

686616923 is a deficient number, since it is larger than the sum of its proper divisors (25865893).

686616923 is a wasteful number, since it uses less digits than its factorization.

686616923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116185.

The product of its digits is 559872, while the sum is 47.

The square root of 686616923 is about 26203.3761756000. The cubic root of 686616923 is about 882.2090347183.

The spelling of 686616923 in words is "six hundred eighty-six million, six hundred sixteen thousand, nine hundred twenty-three".