685016016785 has 8 divisors (see below), whose sum is σ = 822289906536. Its totient is φ = 547832355840.

The previous prime is 685016016781. The next prime is 685016016793. The reversal of 685016016785 is 587610610586.

It can be written as a sum of positive squares in 4 ways, for example, as 17540088721 + 667475928064 = 132439^2 + 816992^2 .

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

It is not a de Polignac number, because 685016016785 - 2² = 685016016781 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (685016016781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22540496 + ... + 22570865.

It is an arithmetic number, because the mean of its divisors is an integer number (102786238317).

Almost surely, 2^685016016785 is an apocalyptic number.

It is an amenable number.

685016016785 is a deficient number, since it is larger than the sum of its proper divisors (137273889751).

685016016785 is a wasteful number, since it uses less digits than its factorization.

685016016785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45114403.

The product of its (nonzero) digits is 2419200, while the sum is 53.

The spelling of 685016016785 in words is "six hundred eighty-five billion, sixteen million, sixteen thousand, seven hundred eighty-five".