817315517472 has 48 divisors (see below), whose sum is σ = 2153198621952. Its totient is φ = 271454964480.

The previous prime is 817315517461. The next prime is 817315517533. The reversal of 817315517472 is 274715513718.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15341104 + ... + 15394287.

It is an arithmetic number, because the mean of its divisors is an integer number (44858304624).

Almost surely, 2^817315517472 is an apocalyptic number.

It is an amenable number.

817315517472 is an abundant number, since it is smaller than the sum of its proper divisors (1335883104480).

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

817315517472 is a wasteful number, since it uses less digits than its factorization.

817315517472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30735681 (or 30735673 counting only the distinct ones).

The product of its digits is 1646400, while the sum is 51.

The spelling of 817315517472 in words is "eight hundred seventeen billion, three hundred fifteen million, five hundred seventeen thousand, four hundred seventy-two".