685893706969 has 27 divisors (see below), whose sum is σ = 714128750517. Its totient is φ = 658766441784.

The previous prime is 685893706913. The next prime is 685893706997. The reversal of 685893706969 is 969607398586.

The square root of 685893706969 is 828187.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 685893706969 - 2¹⁷ = 685893575897 is a prime.

It is a super-2 number, since 2×685893706969² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 685893706895 and 685893706904.

It is not an unprimeable number, because it can be changed into a prime (685893706369) 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 26 ways as a sum of consecutive naturals, for example, 2607960732 + ... + 2607960994.

Almost surely, 2^685893706969 is an apocalyptic number.

685893706969 is the 828187-th square number.

685893706969 is the 414094-th centered octagonal number.

It is an amenable number.

685893706969 is a deficient number, since it is larger than the sum of its proper divisors (28235043548).

685893706969 is an frugal number, since it uses more digits than its factorization.

685893706969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 754 (or 377 counting only the distinct ones).

The product of its (nonzero) digits is 1058158080, while the sum is 76.

The spelling of 685893706969 in words is "six hundred eighty-five billion, eight hundred ninety-three million, seven hundred six thousand, nine hundred sixty-nine".