6668372738666 has 32 divisors (see below), whose sum is σ = 10138713919488. Its totient is φ = 3289142626560.

The previous prime is 6668372738633. The next prime is 6668372738681.

It is a happy number.

6668372738666 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 6668372738593 and 6668372738602.

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 15 ways as a sum of consecutive naturals, for example, 39889331 + ... + 40056153.

It is an arithmetic number, because the mean of its divisors is an integer number (316834809984).

Almost surely, 2^{6668372738666} is an apocalyptic number.

6668372738666 is a deficient number, since it is larger than the sum of its proper divisors (3470341180822).

6668372738666 is a wasteful number, since it uses less digits than its factorization.

6668372738666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167846.

The product of its digits is 2633637888, while the sum is 74.

The spelling of 6668372738666 in words is "six trillion, six hundred sixty-eight billion, three hundred seventy-two million, seven hundred thirty-eight thousand, six hundred sixty-six".