685409473965 has 16 divisors (see below), whose sum is σ = 1097496828288. Its totient is φ = 365271162816.

The previous prime is 685409473937. The next prime is 685409473981. The reversal of 685409473965 is 569374904586.

It is not a de Polignac number, because 685409473965 - 2¹⁹ = 685408949677 is a prime.

It is a super-2 number, since 2×685409473965² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 685409473896 and 685409473905.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 17514594 + ... + 17553683.

It is an arithmetic number, because the mean of its divisors is an integer number (68593551768).

Almost surely, 2^685409473965 is an apocalyptic number.

It is an amenable number.

685409473965 is a deficient number, since it is larger than the sum of its proper divisors (412087354323).

685409473965 is a wasteful number, since it uses less digits than its factorization.

685409473965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35069588.

The product of its (nonzero) digits is 195955200, while the sum is 66.

The spelling of 685409473965 in words is "six hundred eighty-five billion, four hundred nine million, four hundred seventy-three thousand, nine hundred sixty-five".