820217865597 has 32 divisors (see below), whose sum is σ = 1262052586368. Its totient is φ = 469334685696.

The previous prime is 820217865587. The next prime is 820217865617. The reversal of 820217865597 is 795568712028.

It is not a de Polignac number, because 820217865597 - 2⁴ = 820217865581 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 820217865597.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820217865587) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7397568 + ... + 7507625.

It is an arithmetic number, because the mean of its divisors is an integer number (39439143324).

Almost surely, 2^820217865597 is an apocalyptic number.

It is an amenable number.

820217865597 is a deficient number, since it is larger than the sum of its proper divisors (441834720771).

820217865597 is a wasteful number, since it uses less digits than its factorization.

820217865597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14905309.

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

The spelling of 820217865597 in words is "eight hundred twenty billion, two hundred seventeen million, eight hundred sixty-five thousand, five hundred ninety-seven".