6605607521 has 16 divisors (see below), whose sum is σ = 7106880384. Its totient is φ = 6123515904.

The previous prime is 6605607509. The next prime is 6605607529. The reversal of 6605607521 is 1257065066.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6605607521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6605607529) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 203606 + ... + 233808.

It is an arithmetic number, because the mean of its divisors is an integer number (444180024).

Almost surely, 2^6605607521 is an apocalyptic number.

It is an amenable number.

6605607521 is a deficient number, since it is larger than the sum of its proper divisors (501272863).

6605607521 is a wasteful number, since it uses less digits than its factorization.

6605607521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30520.

The product of its (nonzero) digits is 75600, while the sum is 38.

The square root of 6605607521 is about 81274.8886249621. Note that the first 3 decimals coincide. The cubic root of 6605607521 is about 1876.3085404156.

The spelling of 6605607521 in words is "six billion, six hundred five million, six hundred seven thousand, five hundred twenty-one".