6530855681520 has 400 divisors, whose sum is σ = 23641725499392. Its totient is φ = 1669013890560.

The previous prime is 6530855681503. The next prime is 6530855681527. The reversal of 6530855681520 is 251865580356.

6530855681520 is a `hidden beast` number, since 6 + 5 + 3 + 0 + 8 + 55 + 68 + 1 + 520 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6530855681527) by changing a digit.

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 79 ways as a sum of consecutive naturals, for example, 20532819 + ... + 20848461.

Almost surely, 2^{6530855681520} is an apocalyptic number.

6530855681520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6530855681520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11820862749696).

6530855681520 is an abundant number, since it is smaller than the sum of its proper divisors (17110869817872).

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

6530855681520 is a wasteful number, since it uses less digits than its factorization.

6530855681520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315802 (or 315787 counting only the distinct ones).

The product of its (nonzero) digits is 8640000, while the sum is 54.

The spelling of 6530855681520 in words is "six trillion, five hundred thirty billion, eight hundred fifty-five million, six hundred eighty-one thousand, five hundred twenty".