8397817855320 has 128 divisors (see below), whose sum is σ = 25291801578240. Its totient is φ = 2230681904640.

The previous prime is 8397817855211. The next prime is 8397817855331. The reversal of 8397817855320 is 235587187938.

It is a super-2 number, since 2×8397817855320² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 94941915 + ... + 95030325.

It is an arithmetic number, because the mean of its divisors is an integer number (197592199830).

Almost surely, 2^{8397817855320} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8397817855320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12645900789120).

8397817855320 is an abundant number, since it is smaller than the sum of its proper divisors (16893983722920).

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

8397817855320 is a wasteful number, since it uses less digits than its factorization.

8397817855320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91505 (or 91501 counting only the distinct ones).

The product of its (nonzero) digits is 101606400, while the sum is 66.

The spelling of 8397817855320 in words is "eight trillion, three hundred ninety-seven billion, eight hundred seventeen million, eight hundred fifty-five thousand, three hundred twenty".