817215316894 has 8 divisors (see below), whose sum is σ = 1246599636120. Its totient is φ = 401682104856.

The previous prime is 817215316871. The next prime is 817215316969. The reversal of 817215316894 is 498613512718.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3462776649 + ... + 3462776884.

It is an arithmetic number, because the mean of its divisors is an integer number (155824954515).

Almost surely, 2^817215316894 is an apocalyptic number.

817215316894 is a deficient number, since it is larger than the sum of its proper divisors (429384319226).

817215316894 is a wasteful number, since it uses less digits than its factorization.

817215316894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6925553594.

The product of its digits is 2903040, while the sum is 55.

The spelling of 817215316894 in words is "eight hundred seventeen billion, two hundred fifteen million, three hundred sixteen thousand, eight hundred ninety-four".