817138425597 has 24 divisors (see below), whose sum is σ = 1186292042208. Its totient is φ = 500076158400.

The previous prime is 817138425589. The next prime is 817138425617. The reversal of 817138425597 is 795524831718.

It is not a de Polignac number, because 817138425597 - 2³ = 817138425589 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 817138425597.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (817138425517) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4360479 + ... + 4544012.

It is an arithmetic number, because the mean of its divisors is an integer number (49428835092).

Almost surely, 2^817138425597 is an apocalyptic number.

It is an amenable number.

817138425597 is a deficient number, since it is larger than the sum of its proper divisors (369153616611).

817138425597 is a wasteful number, since it uses less digits than its factorization.

817138425597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8904701 (or 8904688 counting only the distinct ones).

The product of its digits is 16934400, while the sum is 60.

The spelling of 817138425597 in words is "eight hundred seventeen billion, one hundred thirty-eight million, four hundred twenty-five thousand, five hundred ninety-seven".