6663881 has 16 divisors (see below), whose sum is σ = 8346240. Its totient is φ = 5187840.

The previous prime is 6663869. The next prime is 6663893. The reversal of 6663881 is 1883666.

It is an interprime number because it is at equal distance from previous prime (6663869) and next prime (6663893).

It is not a de Polignac number, because 6663881 - 2¹⁰ = 6662857 is a prime.

It is a super-2 number, since 2×6663881² = 88814619964322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6663841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2486 + ... + 4416.

It is an arithmetic number, because the mean of its divisors is an integer number (521640).

Almost surely, 2^6663881 is an apocalyptic number.

It is an amenable number.

6663881 is a deficient number, since it is larger than the sum of its proper divisors (1682359).

6663881 is a wasteful number, since it uses less digits than its factorization.

6663881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1984.

The product of its digits is 41472, while the sum is 38.

The square root of 6663881 is about 2581.4493990780. The cubic root of 6663881 is about 188.1809879972.

The spelling of 6663881 in words is "six million, six hundred sixty-three thousand, eight hundred eighty-one".