817522997992 has 16 divisors (see below), whose sum is σ = 1568503427040. Its totient is φ = 399255417456.

The previous prime is 817522997969. The next prime is 817522998001. The reversal of 817522997992 is 299799225718.

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, 1188259828 + ... + 1188260515.

It is an arithmetic number, because the mean of its divisors is an integer number (98031464190).

Almost surely, 2^817522997992 is an apocalyptic number.

It is an amenable number.

817522997992 is a deficient number, since it is larger than the sum of its proper divisors (750980429048).

817522997992 is a wasteful number, since it uses less digits than its factorization.

817522997992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2376520392 (or 2376520388 counting only the distinct ones).

The product of its digits is 102876480, while the sum is 70.

The spelling of 817522997992 in words is "eight hundred seventeen billion, five hundred twenty-two million, nine hundred ninety-seven thousand, nine hundred ninety-two".