685808065 has 8 divisors (see below), whose sum is σ = 823111848. Its totient is φ = 548551680.

The previous prime is 685808041. The next prime is 685808083. The reversal of 685808065 is 560808586.

It can be written as a sum of positive squares in 4 ways, for example, as 137452176 + 548355889 = 11724^2 + 23417^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 685808065 - 2⁹ = 685807553 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43489 + ... + 57121.

It is an arithmetic number, because the mean of its divisors is an integer number (102888981).

Almost surely, 2^685808065 is an apocalyptic number.

It is an amenable number.

685808065 is a deficient number, since it is larger than the sum of its proper divisors (137303783).

685808065 is a wasteful number, since it uses less digits than its factorization.

685808065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23699.

The product of its (nonzero) digits is 460800, while the sum is 46.

The square root of 685808065 is about 26187.9373949152. The cubic root of 685808065 is about 881.8624745511.

The spelling of 685808065 in words is "six hundred eighty-five million, eight hundred eight thousand, sixty-five".