666668080808 has 16 divisors (see below), whose sum is σ = 1279072481280. Its totient is φ = 325582085808.

The previous prime is 666668080781. The next prime is 666668080829. The reversal of 666668080808 is 808080866666.

It is a super-4 number, since 4×666668080808⁴ (a number of 48 digits) contains 4444 as substring.

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 3 ways as a sum of consecutive naturals, for example, 968993960 + ... + 968994647.

It is an arithmetic number, because the mean of its divisors is an integer number (79942030080).

Almost surely, 2^666668080808 is an apocalyptic number.

It is an amenable number.

666668080808 is a deficient number, since it is larger than the sum of its proper divisors (612404400472).

666668080808 is a wasteful number, since it uses less digits than its factorization.

666668080808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1937988656 (or 1937988652 counting only the distinct ones).

The product of its (nonzero) digits is 31850496, while the sum is 62.

The spelling of 666668080808 in words is "six hundred sixty-six billion, six hundred sixty-eight million, eighty thousand, eight hundred eight".