6641111655 has 24 divisors (see below), whose sum is σ = 12011751648. Its totient is φ = 3387928896.

The previous prime is 6641111627. The next prime is 6641111669. The reversal of 6641111655 is 5561111466.

6641111655 is a `hidden beast` number, since 6 + 641 + 1 + 1 + 1 + 6 + 5 + 5 = 666.

It is not a de Polignac number, because 6641111655 - 2⁷ = 6641111527 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 (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3207232 + ... + 3209301.

It is an arithmetic number, because the mean of its divisors is an integer number (500489652).

Almost surely, 2^6641111655 is an apocalyptic number.

6641111655 is a deficient number, since it is larger than the sum of its proper divisors (5370639993).

6641111655 is a wasteful number, since it uses less digits than its factorization.

6641111655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6416567 (or 6416564 counting only the distinct ones).

The product of its digits is 21600, while the sum is 36.

The square root of 6641111655 is about 81493.0159891018. The cubic root of 6641111655 is about 1879.6641597735.

The spelling of 6641111655 in words is "six billion, six hundred forty-one million, one hundred eleven thousand, six hundred fifty-five".