6681663 has 16 divisors (see below), whose sum is σ = 10481760. Its totient is φ = 4192128.

The previous prime is 6681637. The next prime is 6681671. The reversal of 6681663 is 3661866.

It is not a de Polignac number, because 6681663 - 2²⁰ = 5633087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6681683) 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, 6820 + ... + 7737.

It is an arithmetic number, because the mean of its divisors is an integer number (655110).

Almost surely, 2^6681663 is an apocalyptic number.

6681663 is a deficient number, since it is larger than the sum of its proper divisors (3800097).

6681663 is a wasteful number, since it uses less digits than its factorization.

6681663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14583 (or 14577 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 6681663 is about 2584.8912936524. The cubic root of 6681663 is about 188.3482209931.

The spelling of 6681663 in words is "six million, six hundred eighty-one thousand, six hundred sixty-three".