685234384173 has 24 divisors (see below), whose sum is σ = 994905140736. Its totient is φ = 454463848800.

The previous prime is 685234384151. The next prime is 685234384183. The reversal of 685234384173 is 371483432586.

It is a happy number.

685234384173 is a `hidden beast` number, since 6 + 8 + 52 + 343 + 84 + 173 = 666.

It is not a de Polignac number, because 685234384173 - 2⁵ = 685234384141 is a prime.

It is a super-2 number, since 2×685234384173² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685234384183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1443708 + ... + 1858698.

It is an arithmetic number, because the mean of its divisors is an integer number (41454380864).

Almost surely, 2^685234384173 is an apocalyptic number.

It is an amenable number.

685234384173 is a deficient number, since it is larger than the sum of its proper divisors (309670756563).

685234384173 is a wasteful number, since it uses less digits than its factorization.

685234384173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415945 (or 415942 counting only the distinct ones).

The product of its digits is 11612160, while the sum is 54.

The spelling of 685234384173 in words is "six hundred eighty-five billion, two hundred thirty-four million, three hundred eighty-four thousand, one hundred seventy-three".