685658345 has 4 divisors (see below), whose sum is σ = 822790020. Its totient is φ = 548526672.

The previous prime is 685658327. The next prime is 685658353. The reversal of 685658345 is 543856586.

685658345 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 544428889 + 141229456 = 23333^2 + 11884^2 .

It is a cyclic number.

It is not a de Polignac number, because 685658345 - 2¹⁰ = 685657321 is a prime.

It is a super-3 number, since 3×685658345³ (a number of 27 digits) contains 333 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 685658293 and 685658302.

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, 68565830 + ... + 68565839.

It is an arithmetic number, because the mean of its divisors is an integer number (205697505).

Almost surely, 2^685658345 is an apocalyptic number.

It is an amenable number.

685658345 is a deficient number, since it is larger than the sum of its proper divisors (137131675).

685658345 is a wasteful number, since it uses less digits than its factorization.

685658345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137131674.

The product of its digits is 3456000, while the sum is 50.

The square root of 685658345 is about 26185.0786708767. The cubic root of 685658345 is about 881.7982962163.

The spelling of 685658345 in words is "six hundred eighty-five million, six hundred fifty-eight thousand, three hundred forty-five".