6600552721 has 8 divisors (see below), whose sum is σ = 7548713600. Its totient is φ = 5653698048.

The previous prime is 6600552691. The next prime is 6600552737. The reversal of 6600552721 is 1272550066.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6600552721 - 2⁵ = 6600552689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6600552421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 315696 + ... + 335953.

It is an arithmetic number, because the mean of its divisors is an integer number (943589200).

Almost surely, 2^6600552721 is an apocalyptic number.

It is an amenable number.

6600552721 is a deficient number, since it is larger than the sum of its proper divisors (948160879).

6600552721 is a wasteful number, since it uses less digits than its factorization.

6600552721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 653103.

The product of its (nonzero) digits is 25200, while the sum is 34.

The square root of 6600552721 is about 81243.7857377412. The cubic root of 6600552721 is about 1875.8298166119.

The spelling of 6600552721 in words is "six billion, six hundred million, five hundred fifty-two thousand, seven hundred twenty-one".