816717712265 has 64 divisors (see below), whose sum is σ = 1221113187840. Its totient is φ = 513655084800.

The previous prime is 816717712259. The next prime is 816717712277. The reversal of 816717712265 is 562217717618.

It is a happy number.

It is not a de Polignac number, because 816717712265 - 2⁴ = 816717712249 is a prime.

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 63 ways as a sum of consecutive naturals, for example, 12038690 + ... + 12106340.

It is an arithmetic number, because the mean of its divisors is an integer number (19079893560).

Almost surely, 2^816717712265 is an apocalyptic number.

It is an amenable number.

816717712265 is a deficient number, since it is larger than the sum of its proper divisors (404395475575).

816717712265 is a wasteful number, since it uses less digits than its factorization.

816717712265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67859 (or 67833 counting only the distinct ones).

The product of its digits is 1975680, while the sum is 53.

The spelling of 816717712265 in words is "eight hundred sixteen billion, seven hundred seventeen million, seven hundred twelve thousand, two hundred sixty-five".