685617161 has 8 divisors (see below), whose sum is σ = 690869184. Its totient is φ = 680374800.

The previous prime is 685617151. The next prime is 685617199. The reversal of 685617161 is 161716586.

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

It is a cyclic number.

It is not a de Polignac number, because 685617161 - 2²² = 681422857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (685617151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 205670 + ... + 208976.

It is an arithmetic number, because the mean of its divisors is an integer number (86358648).

Almost surely, 2^685617161 is an apocalyptic number.

It is an amenable number.

685617161 is a deficient number, since it is larger than the sum of its proper divisors (5252023).

685617161 is a wasteful number, since it uses less digits than its factorization.

685617161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4831.

The product of its digits is 60480, while the sum is 41.

The square root of 685617161 is about 26184.2922570002. The cubic root of 685617161 is about 881.7806408206.

The spelling of 685617161 in words is "six hundred eighty-five million, six hundred seventeen thousand, one hundred sixty-one".