6605611655 has 4 divisors (see below), whose sum is σ = 7926733992. Its totient is φ = 5284489320.

The previous prime is 6605611627. The next prime is 6605611703. The reversal of 6605611655 is 5561165066.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 6605611655 - 2²⁰ = 6604563079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 660561161 + ... + 660561170.

It is an arithmetic number, because the mean of its divisors is an integer number (1981683498).

Almost surely, 2^6605611655 is an apocalyptic number.

6605611655 is a deficient number, since it is larger than the sum of its proper divisors (1321122337).

6605611655 is a wasteful number, since it uses less digits than its factorization.

6605611655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1321122336.

The product of its (nonzero) digits is 162000, while the sum is 41.

The square root of 6605611655 is about 81274.9140571677. The cubic root of 6605611655 is about 1876.3089318334.

The spelling of 6605611655 in words is "six billion, six hundred five million, six hundred eleven thousand, six hundred fifty-five".