685222858017 has 20 divisors (see below), whose sum is σ = 1026874856260. Its totient is φ = 455355748224.

The previous prime is 685222858013. The next prime is 685222858039. The reversal of 685222858017 is 710858222586.

685222858017 is a `hidden beast` number, since 6 + 8 + 5 + 22 + 28 + 580 + 17 = 666.

685222858017 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 97778788416 + 587444069601 = 312696^2 + 766449^2 .

It is not a de Polignac number, because 685222858017 - 2² = 685222858013 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (685222858013) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 13488292 + ... + 13538997.

It is an arithmetic number, because the mean of its divisors is an integer number (51343742813).

Almost surely, 2^685222858017 is an apocalyptic number.

It is an amenable number.

685222858017 is a deficient number, since it is larger than the sum of its proper divisors (341651998243).

685222858017 is a wasteful number, since it uses less digits than its factorization.

685222858017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27027614 (or 27027605 counting only the distinct ones).

The product of its (nonzero) digits is 4300800, while the sum is 54.

The spelling of 685222858017 in words is "six hundred eighty-five billion, two hundred twenty-two million, eight hundred fifty-eight thousand, seventeen".