66111665072 has 20 divisors (see below), whose sum is σ = 128383144560. Its totient is φ = 32980531008.

The previous prime is 66111665063. The next prime is 66111665077. The reversal of 66111665072 is 27056611166.

It is not an unprimeable number, because it can be changed into a prime (66111665077) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4699103 + ... + 4713150.

It is an arithmetic number, because the mean of its divisors is an integer number (6419157228).

Almost surely, 2^66111665072 is an apocalyptic number.

It is an amenable number.

66111665072 is a deficient number, since it is larger than the sum of its proper divisors (62271479488).

66111665072 is a wasteful number, since it uses less digits than its factorization.

66111665072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9412700 (or 9412694 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 41.

The spelling of 66111665072 in words is "sixty-six billion, one hundred eleven million, six hundred sixty-five thousand, seventy-two".