6605664541 has 4 divisors (see below), whose sum is σ = 7549330912. Its totient is φ = 5661998172.

The previous prime is 6605664523. The next prime is 6605664599. The reversal of 6605664541 is 1454665066.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1454665066 = 2 ⋅727332533.

It is a cyclic number.

It is not a de Polignac number, because 6605664541 - 2⁵ = 6605664509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6605664511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 471833175 + ... + 471833188.

It is an arithmetic number, because the mean of its divisors is an integer number (1887332728).

Almost surely, 2^6605664541 is an apocalyptic number.

It is an amenable number.

6605664541 is a deficient number, since it is larger than the sum of its proper divisors (943666371).

6605664541 is an equidigital number, since it uses as much as digits as its factorization.

6605664541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 943666370.

The product of its (nonzero) digits is 518400, while the sum is 43.

The square root of 6605664541 is about 81275.2394090599. The cubic root of 6605664541 is about 1876.3139392026.

The spelling of 6605664541 in words is "six billion, six hundred five million, six hundred sixty-four thousand, five hundred forty-one".