817956868904 has 32 divisors (see below), whose sum is σ = 1753796568000. Its totient is φ = 350346574080.

The previous prime is 817956868889. The next prime is 817956868931. The reversal of 817956868904 is 409868659718.

It is a super-2 number, since 2×817956868904² (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 (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4203377 + ... + 4393664.

It is an arithmetic number, because the mean of its divisors is an integer number (54806142750).

Almost surely, 2^817956868904 is an apocalyptic number.

It is an amenable number.

817956868904 is an abundant number, since it is smaller than the sum of its proper divisors (935839699096).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

817956868904 is a wasteful number, since it uses less digits than its factorization.

817956868904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8598753 (or 8598749 counting only the distinct ones).

The product of its (nonzero) digits is 209018880, while the sum is 71.

The spelling of 817956868904 in words is "eight hundred seventeen billion, nine hundred fifty-six million, eight hundred sixty-eight thousand, nine hundred four".