6521622656 has 32 divisors (see below), whose sum is σ = 12995942400. Its totient is φ = 3259896064.

The previous prime is 6521622641. The next prime is 6521622673. The reversal of 6521622656 is 6562261256.

It is a tau number, because it is divible by the number of its divisors (32).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 856241 + ... + 863823.

It is an arithmetic number, because the mean of its divisors is an integer number (406123200).

Almost surely, 2^6521622656 is an apocalyptic number.

It is an amenable number.

6521622656 is a deficient number, since it is larger than the sum of its proper divisors (6474319744).

6521622656 is an equidigital number, since it uses as much as digits as its factorization.

6521622656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14316 (or 14304 counting only the distinct ones).

The product of its digits is 259200, while the sum is 41.

The square root of 6521622656 is about 80756.5641666360. The cubic root of 6521622656 is about 1868.3226932216.

The spelling of 6521622656 in words is "six billion, five hundred twenty-one million, six hundred twenty-two thousand, six hundred fifty-six".