66982957808 has 40 divisors (see below), whose sum is σ = 147118448400. Its totient is φ = 29288093184.

The previous prime is 66982957793. The next prime is 66982957849. The reversal of 66982957808 is 80875928966.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8470613 + ... + 8478516.

It is an arithmetic number, because the mean of its divisors is an integer number (3677961210).

Almost surely, 2^66982957808 is an apocalyptic number.

It is an amenable number.

66982957808 is an abundant number, since it is smaller than the sum of its proper divisors (80135490592).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66982957808 is a wasteful number, since it uses less digits than its factorization.

66982957808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16949169 (or 16949163 counting only the distinct ones).

The product of its (nonzero) digits is 104509440, while the sum is 68.

The spelling of 66982957808 in words is "sixty-six billion, nine hundred eighty-two million, nine hundred fifty-seven thousand, eight hundred eight".