815685316217 has 8 divisors (see below), whose sum is σ = 824872014720. Its totient is φ = 806499100000.

The previous prime is 815685316207. The next prime is 815685316253. The reversal of 815685316217 is 712613586518.

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 815685316217 - 2¹² = 815685312121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (815685316207) 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, 4113092 + ... + 4306842.

It is an arithmetic number, because the mean of its divisors is an integer number (103109001840).

Almost surely, 2^815685316217 is an apocalyptic number.

It is an amenable number.

815685316217 is a deficient number, since it is larger than the sum of its proper divisors (9186698503).

815685316217 is a wasteful number, since it uses less digits than its factorization.

815685316217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241143.

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

The spelling of 815685316217 in words is "eight hundred fifteen billion, six hundred eighty-five million, three hundred sixteen thousand, two hundred seventeen".