6641855 has 16 divisors (see below), whose sum is σ = 8753184. Its totient is φ = 4798080.

The previous prime is 6641851. The next prime is 6641867. The reversal of 6641855 is 5581466.

It is a happy number.

It is not a de Polignac number, because 6641855 - 2² = 6641851 is a prime.

It is a super-2 number, since 2×6641855² = 88228475682050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6641851) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10529 + ... + 11141.

It is an arithmetic number, because the mean of its divisors is an integer number (547074).

Almost surely, 2^6641855 is an apocalyptic number.

6641855 is a deficient number, since it is larger than the sum of its proper divisors (2111329).

6641855 is a wasteful number, since it uses less digits than its factorization.

6641855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 826.

The product of its digits is 28800, while the sum is 35.

The square root of 6641855 is about 2577.1796600160. The cubic root of 6641855 is about 187.9734287934.

The spelling of 6641855 in words is "six million, six hundred forty-one thousand, eight hundred fifty-five".