685612811 has 4 divisors (see below), whose sum is σ = 738352272. Its totient is φ = 632873352.

The previous prime is 685612793. The next prime is 685612841. The reversal of 685612811 is 118216586.

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 685612811 - 2⁶ = 685612747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (685612841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26369711 + ... + 26369736.

It is an arithmetic number, because the mean of its divisors is an integer number (184588068).

Almost surely, 2^685612811 is an apocalyptic number.

685612811 is a deficient number, since it is larger than the sum of its proper divisors (52739461).

685612811 is a wasteful number, since it uses less digits than its factorization.

685612811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52739460.

The product of its digits is 23040, while the sum is 38.

The square root of 685612811 is about 26184.2091918011. The cubic root of 685612811 is about 881.7787759539.

The spelling of 685612811 in words is "six hundred eighty-five million, six hundred twelve thousand, eight hundred eleven".