6641273856 has 352 divisors, whose sum is σ = 22043930112. Its totient is φ = 1734082560.

The previous prime is 6641273843. The next prime is 6641273879. The reversal of 6641273856 is 6583721466.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13525771 + ... + 13526261.

Almost surely, 2^6641273856 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 6641273856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11021965056).

6641273856 is an abundant number, since it is smaller than the sum of its proper divisors (15402656256).

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

6641273856 is a wasteful number, since it uses less digits than its factorization.

6641273856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575 (or 557 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 48.

The square root of 6641273856 is about 81494.0111664655. The cubic root of 6641273856 is about 1879.6794624788.

The spelling of 6641273856 in words is "six billion, six hundred forty-one million, two hundred seventy-three thousand, eight hundred fifty-six".