6541866 has 12 divisors (see below), whose sum is σ = 14174082. Its totient is φ = 2180616.

The previous prime is 6541841. The next prime is 6541877. The reversal of 6541866 is 6681456.

It can be written as a sum of positive squares in only one way, i.e., 5861241 + 680625 = 2421^2 + 825^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 6541866.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 181701 + ... + 181736.

Almost surely, 2^6541866 is an apocalyptic number.

6541866 is an abundant number, since it is smaller than the sum of its proper divisors (7632216).

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

6541866 is a wasteful number, since it uses less digits than its factorization.

6541866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363445 (or 363442 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 6541866 is about 2557.7071763593. The cubic root of 6541866 is about 187.0253809430.

The spelling of 6541866 in words is "six million, five hundred forty-one thousand, eight hundred sixty-six".