6641171855 has 16 divisors (see below), whose sum is σ = 8000876928. Its totient is φ = 5292000000.

The previous prime is 6641171813. The next prime is 6641171879. The reversal of 6641171855 is 5581711466.

It is not a de Polignac number, because 6641171855 - 2⁸ = 6641171599 is a prime.

It is a Duffinian number.

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 15 ways as a sum of consecutive naturals, for example, 1578755 + ... + 1582955.

It is an arithmetic number, because the mean of its divisors is an integer number (500054808).

Almost surely, 2^6641171855 is an apocalyptic number.

6641171855 is a deficient number, since it is larger than the sum of its proper divisors (1359705073).

6641171855 is a wasteful number, since it uses less digits than its factorization.

6641171855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5378.

The product of its digits is 201600, while the sum is 44.

The square root of 6641171855 is about 81493.3853450696. The cubic root of 6641171855 is about 1879.6698393166.

The spelling of 6641171855 in words is "six billion, six hundred forty-one million, one hundred seventy-one thousand, eight hundred fifty-five".