685685899829 has 8 divisors (see below), whose sum is σ = 783651032640. Its totient is φ = 587723268096.

The previous prime is 685685899799. The next prime is 685685899931. The reversal of 685685899829 is 928998586586.

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 685685899829 - 2²⁸ = 685417464373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685685893829) 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, 4502 + ... + 1171064.

It is an arithmetic number, because the mean of its divisors is an integer number (97956379080).

Almost surely, 2^685685899829 is an apocalyptic number.

It is an amenable number.

685685899829 is a deficient number, since it is larger than the sum of its proper divisors (97965132811).

685685899829 is a wasteful number, since it uses less digits than its factorization.

685685899829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1250539.

The product of its digits is 5374771200, while the sum is 83.

The spelling of 685685899829 in words is "six hundred eighty-five billion, six hundred eighty-five million, eight hundred ninety-nine thousand, eight hundred twenty-nine".