685163399 has 4 divisors (see below), whose sum is σ = 714953136. Its totient is φ = 655373664.

The previous prime is 685163371. The next prime is 685163417. The reversal of 685163399 is 993361586.

685163399 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 is a cyclic number.

It is not a de Polignac number, because 685163399 - 2¹⁶ = 685097863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685163329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14894834 + ... + 14894879.

It is an arithmetic number, because the mean of its divisors is an integer number (178738284).

Almost surely, 2^685163399 is an apocalyptic number.

685163399 is a deficient number, since it is larger than the sum of its proper divisors (29789737).

685163399 is a wasteful number, since it uses less digits than its factorization.

685163399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29789736.

The product of its digits is 1049760, while the sum is 50.

The square root of 685163399 is about 26175.6260479095. The cubic root of 685163399 is about 881.5860682649.

The spelling of 685163399 in words is "six hundred eighty-five million, one hundred sixty-three thousand, three hundred ninety-nine".