6668840042 has 16 divisors (see below), whose sum is σ = 10185695520. Its totient is φ = 3273933168.

The previous prime is 6668839993. The next prime is 6668840083. The reversal of 6668840042 is 2400488666.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 6668839975 and 6668840002.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39917 + ... + 122192.

It is an arithmetic number, because the mean of its divisors is an integer number (636605970).

Almost surely, 2^6668840042 is an apocalyptic number.

6668840042 is a deficient number, since it is larger than the sum of its proper divisors (3516855478).

6668840042 is a wasteful number, since it uses less digits than its factorization.

6668840042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162485.

The product of its (nonzero) digits is 442368, while the sum is 44.

The square root of 6668840042 is about 81662.9661596981. The cubic root of 6668840042 is about 1882.2765579902.

The spelling of 6668840042 in words is "six billion, six hundred sixty-eight million, eight hundred forty thousand, forty-two".