6566821632 has 540 divisors, whose sum is σ = 23852915856. Its totient is φ = 1788272640.

The previous prime is 6566821631. The next prime is 6566821637. The reversal of 6566821632 is 2361286656.

6566821632 is a `hidden beast` number, since 6 + 5 + 6 + 6 + 8 + 2 + 1 + 632 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6566821631) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 23369332 + ... + 23369612.

Almost surely, 2^6566821632 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 6566821632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11926457928).

6566821632 is an abundant number, since it is smaller than the sum of its proper divisors (17286094224).

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

6566821632 is a wasteful number, since it uses less digits than its factorization.

6566821632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346 (or 316 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

The square root of 6566821632 is about 81035.9280319538. The cubic root of 6566821632 is about 1872.6289799646.

The spelling of 6566821632 in words is "six billion, five hundred sixty-six million, eight hundred twenty-one thousand, six hundred thirty-two".