6466555872 has 216 divisors, whose sum is σ = 21486877776. Its totient is φ = 1839366144.

The previous prime is 6466555871. The next prime is 6466555883. The reversal of 6466555872 is 2785556646.

6466555872 is a `hidden beast` number, since 6 + 4 + 6 + 6 + 55 + 587 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6466555871) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3625893 + ... + 3627675.

It is an arithmetic number, because the mean of its divisors is an integer number (99476286).

Almost surely, 2^6466555872 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 6466555872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10743438888).

6466555872 is an abundant number, since it is smaller than the sum of its proper divisors (15020321904).

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

6466555872 is a wasteful number, since it uses less digits than its factorization.

6466555872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2070 (or 2052 counting only the distinct ones).

The product of its digits is 12096000, while the sum is 54.

The square root of 6466555872 is about 80414.8983211444. The cubic root of 6466555872 is about 1863.0492889253.

The spelling of 6466555872 in words is "six billion, four hundred sixty-six million, five hundred fifty-five thousand, eight hundred seventy-two".