81335466668 has 12 divisors (see below), whose sum is σ = 145365515232. Its totient is φ = 39802462320.

The previous prime is 81335466649. The next prime is 81335466701. The reversal of 81335466668 is 86666453318.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 216317543 + ... + 216317918.

It is an arithmetic number, because the mean of its divisors is an integer number (12113792936).

Almost surely, 2^81335466668 is an apocalyptic number.

It is an amenable number.

81335466668 is a deficient number, since it is larger than the sum of its proper divisors (64030048564).

81335466668 is a wasteful number, since it uses less digits than its factorization.

81335466668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432635512 (or 432635510 counting only the distinct ones).

The product of its digits is 14929920, while the sum is 56.

The spelling of 81335466668 in words is "eighty-one billion, three hundred thirty-five million, four hundred sixty-six thousand, six hundred sixty-eight".