6553666 has 16 divisors (see below), whose sum is σ = 11723904. Its totient is φ = 2686464.

The previous prime is 6553663. The next prime is 6553733. The reversal of 6553666 is 6663556.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (6553663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9855 + ... + 10498.

It is an arithmetic number, because the mean of its divisors is an integer number (732744).

Almost surely, 2^6553666 is an apocalyptic number.

6553666 is a deficient number, since it is larger than the sum of its proper divisors (5170238).

6553666 is a wasteful number, since it uses less digits than its factorization.

6553666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20385.

The product of its digits is 97200, while the sum is 37.

The square root of 6553666 is about 2560.0128905925. The cubic root of 6553666 is about 187.1377634505.

The spelling of 6553666 in words is "six million, five hundred fifty-three thousand, six hundred sixty-six".