816909510568 has 16 divisors (see below), whose sum is σ = 1533101616180. Its totient is φ = 408082412928.

The previous prime is 816909510511. The next prime is 816909510587. The reversal of 816909510568 is 865015909618.

It can be written as a sum of positive squares in 2 ways, for example, as 783646316644 + 33263193924 = 885238^2 + 182382^2 .

It is a super-2 number, since 2×816909510568² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 46533471 + ... + 46551022.

Almost surely, 2^816909510568 is an apocalyptic number.

It is an amenable number.

816909510568 is a deficient number, since it is larger than the sum of its proper divisors (716192105612).

816909510568 is a wasteful number, since it uses less digits than its factorization.

816909510568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93085596 (or 93085592 counting only the distinct ones).

The product of its (nonzero) digits is 4665600, while the sum is 58.

The spelling of 816909510568 in words is "eight hundred sixteen billion, nine hundred nine million, five hundred ten thousand, five hundred sixty-eight".