6641866 has 64 divisors (see below), whose sum is σ = 13685760. Its totient is φ = 2338560.

The previous prime is 6641851. The next prime is 6641867. The reversal of 6641866 is 6681466.

It is a super-2 number, since 2×6641866² = 88228767923912, which contains 22 as substring.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (6641867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 112545 + ... + 112603.

It is an arithmetic number, because the mean of its divisors is an integer number (213840).

Almost surely, 2^6641866 is an apocalyptic number.

6641866 is an abundant number, since it is smaller than the sum of its proper divisors (7043894).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6641866 is a wasteful number, since it uses less digits than its factorization.

6641866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139.

The product of its digits is 41472, while the sum is 37.

The square root of 6641866 is about 2577.1817941309. The cubic root of 6641866 is about 187.9735325649.

The spelling of 6641866 in words is "six million, six hundred forty-one thousand, eight hundred sixty-six".