685568556859 has 4 divisors (see below), whose sum is σ = 685578061080. Its totient is φ = 685559052640.

The previous prime is 685568556853. The next prime is 685568556863. The reversal of 685568556859 is 958655865586.

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 685568556859 - 2⁷ = 685568556731 is a prime.

It is a super-3 number, since 3×685568556859³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (685568556853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4643077 + ... + 4788454.

It is an arithmetic number, because the mean of its divisors is an integer number (171394515270).

Almost surely, 2^685568556859 is an apocalyptic number.

685568556859 is a deficient number, since it is larger than the sum of its proper divisors (9504221).

685568556859 is an equidigital number, since it uses as much as digits as its factorization.

685568556859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9504220.

The product of its digits is 3110400000, while the sum is 76.

The spelling of 685568556859 in words is "six hundred eighty-five billion, five hundred sixty-eight million, five hundred fifty-six thousand, eight hundred fifty-nine".