66511701668 has 12 divisors (see below), whose sum is σ = 121456151040. Its totient is φ = 31809944232.

The previous prime is 66511701631. The next prime is 66511701671. The reversal of 66511701668 is 86610711566.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 361476548 + ... + 361476731.

It is an arithmetic number, because the mean of its divisors is an integer number (10121345920).

Almost surely, 2^66511701668 is an apocalyptic number.

It is an amenable number.

66511701668 is a deficient number, since it is larger than the sum of its proper divisors (54944449372).

66511701668 is a wasteful number, since it uses less digits than its factorization.

66511701668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 722953306 (or 722953304 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 47.

The spelling of 66511701668 in words is "sixty-six billion, five hundred eleven million, seven hundred one thousand, six hundred sixty-eight".