685586881 has 6 divisors (see below), whose sum is σ = 797519490. Its totient is φ = 587645856.

The previous prime is 685586879. The next prime is 685586929. The reversal of 685586881 is 188685586.

It is a happy number.

685586881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 685392400 + 194481 = 26180^2 + 441^2 .

It is not a de Polignac number, because 685586881 - 2¹ = 685586879 is a prime.

It is a super-2 number, since 2×685586881² = 940058742798616322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (685586981) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6995736 + ... + 6995833.

It is an arithmetic number, because the mean of its divisors is an integer number (132919915).

Almost surely, 2^685586881 is an apocalyptic number.

It is an amenable number.

685586881 is a deficient number, since it is larger than the sum of its proper divisors (111932609).

685586881 is a wasteful number, since it uses less digits than its factorization.

685586881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13991583 (or 13991576 counting only the distinct ones).

The product of its digits is 3686400, while the sum is 55.

The square root of 685586881 is about 26183.7140413655. The cubic root of 685586881 is about 881.7676594697.

The spelling of 685586881 in words is "six hundred eighty-five million, five hundred eighty-six thousand, eight hundred eighty-one".