6561664332 has 24 divisors (see below), whose sum is σ = 15313477872. Its totient is φ = 2186803200.

The previous prime is 6561664327. The next prime is 6561664357. The reversal of 6561664332 is 2334661656.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16732 + ... + 115772.

It is an arithmetic number, because the mean of its divisors is an integer number (638061578).

Almost surely, 2^6561664332 is an apocalyptic number.

It is an amenable number.

6561664332 is an abundant number, since it is smaller than the sum of its proper divisors (8751813540).

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

6561664332 is a wasteful number, since it uses less digits than its factorization.

6561664332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104569 (or 104567 counting only the distinct ones).

The product of its digits is 466560, while the sum is 42.

The square root of 6561664332 is about 81004.1007110134. The cubic root of 6561664332 is about 1872.1386240850.

The spelling of 6561664332 in words is "six billion, five hundred sixty-one million, six hundred sixty-four thousand, three hundred thirty-two".