685660311 has 96 divisors (see below), whose sum is σ = 1221816960. Its totient is φ = 362299392.

The previous prime is 685660307. The next prime is 685660319. The reversal of 685660311 is 113066586.

It is a happy number.

685660311 is a `hidden beast` number, since 68 + 566 + 0 + 31 + 1 = 666.

It is not a de Polignac number, because 685660311 - 2² = 685660307 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685660319) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 7068615 + ... + 7068711.

It is an arithmetic number, because the mean of its divisors is an integer number (12727260).

Almost surely, 2^685660311 is an apocalyptic number.

685660311 is a deficient number, since it is larger than the sum of its proper divisors (536156649).

685660311 is a wasteful number, since it uses less digits than its factorization.

685660311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265 (or 262 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 685660311 is about 26185.1162113136. The cubic root of 685660311 is about 881.7991390140.

The spelling of 685660311 in words is "six hundred eighty-five million, six hundred sixty thousand, three hundred eleven".