6668118878042 has 4 divisors (see below), whose sum is σ = 10002178317066. Its totient is φ = 3334059439020.

The previous prime is 6668118878041. The next prime is 6668118878063. The reversal of 6668118878042 is 2408788118666.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 6484361766481 + 183757111561 = 2546441^2 + 428669^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 6668118878042.

It is not an unprimeable number, because it can be changed into a prime (6668118878041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1667029719509 + ... + 1667029719512.

Almost surely, 2^{6668118878042} is an apocalyptic number.

6668118878042 is a deficient number, since it is larger than the sum of its proper divisors (3334059439024).

6668118878042 is a wasteful number, since it uses less digits than its factorization.

6668118878042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3334059439023.

The product of its (nonzero) digits is 49545216, while the sum is 65.

The spelling of 6668118878042 in words is "six trillion, six hundred sixty-eight billion, one hundred eighteen million, eight hundred seventy-eight thousand, forty-two".