685171916198 has 16 divisors (see below), whose sum is σ = 1281360466944. Its totient is φ = 266950097160.

The previous prime is 685171916183. The next prime is 685171916251. The reversal of 685171916198 is 891619171586.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 685171916198.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2224583990 + ... + 2224584297.

It is an arithmetic number, because the mean of its divisors is an integer number (80085029184).

Almost surely, 2^685171916198 is an apocalyptic number.

685171916198 is a deficient number, since it is larger than the sum of its proper divisors (596188550746).

685171916198 is a wasteful number, since it uses less digits than its factorization.

685171916198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4449168307.

The product of its digits is 6531840, while the sum is 62.

The spelling of 685171916198 in words is "six hundred eighty-five billion, one hundred seventy-one million, nine hundred sixteen thousand, one hundred ninety-eight".