817565368412 has 12 divisors (see below), whose sum is σ = 1540796271336. Its totient is φ = 377337862320.

The previous prime is 817565368391. The next prime is 817565368421. The reversal of 817565368412 is 214863565718.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7861205414 + ... + 7861205517.

It is an arithmetic number, because the mean of its divisors is an integer number (128399689278).

Almost surely, 2^817565368412 is an apocalyptic number.

It is an amenable number.

817565368412 is a deficient number, since it is larger than the sum of its proper divisors (723230902924).

817565368412 is a wasteful number, since it uses less digits than its factorization.

817565368412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15722410948 (or 15722410946 counting only the distinct ones).

The product of its digits is 9676800, while the sum is 56.

The spelling of 817565368412 in words is "eight hundred seventeen billion, five hundred sixty-five million, three hundred sixty-eight thousand, four hundred twelve".