6605561605 has 8 divisors (see below), whose sum is σ = 7933131000. Its totient is φ = 5280144576.

The previous prime is 6605561597. The next prime is 6605561621. The reversal of 6605561605 is 5061655066.

It can be written as a sum of positive squares in 4 ways, for example, as 1499315841 + 5106245764 = 38721^2 + 71458^2 .

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 6605561605 - 2³ = 6605561597 is a prime.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 531330 + ... + 543619.

It is an arithmetic number, because the mean of its divisors is an integer number (991641375).

Almost surely, 2^6605561605 is an apocalyptic number.

It is an amenable number.

6605561605 is a deficient number, since it is larger than the sum of its proper divisors (1327569395).

6605561605 is a wasteful number, since it uses less digits than its factorization.

6605561605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1076183.

The product of its (nonzero) digits is 162000, while the sum is 40.

The square root of 6605561605 is about 81274.6061509990. The cubic root of 6605561605 is about 1876.3041929586.

The spelling of 6605561605 in words is "six billion, six hundred five million, five hundred sixty-one thousand, six hundred five".