6556641280 has 384 divisors, whose sum is σ = 19416983040. Its totient is φ = 2076180480.

The previous prime is 6556641263. The next prime is 6556641281. The reversal of 6556641280 is 821466556.

It is not an unprimeable number, because it can be changed into a prime (6556641281) 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, 67594192 + ... + 67594288.

It is an arithmetic number, because the mean of its divisors is an integer number (50565060).

Almost surely, 2^6556641280 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 6556641280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9708491520).

6556641280 is an abundant number, since it is smaller than the sum of its proper divisors (12860341760).

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

6556641280 is a wasteful number, since it uses less digits than its factorization.

6556641280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195 (or 175 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 43.

The square root of 6556641280 is about 80973.0898508881. The cubic root of 6556641280 is about 1871.6607854453.

The spelling of 6556641280 in words is "six billion, five hundred fifty-six million, six hundred forty-one thousand, two hundred eighty".