66745083816 has 24 divisors (see below), whose sum is σ = 180767935530. Its totient is φ = 22248361248.

The previous prime is 66745083799. The next prime is 66745083857. The reversal of 66745083816 is 61838054766.

66745083816 is a `hidden beast` number, since 66 + 74 + 508 + 3 + 8 + 1 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 44440856100 + 22304227716 = 210810^2 + 149346^2 .

It is a tau number, because it is divible by the number of its divisors (24).

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 5 ways as a sum of consecutive naturals, for example, 463507455 + ... + 463507598.

Almost surely, 2^66745083816 is an apocalyptic number.

It is an amenable number.

66745083816 is an abundant number, since it is smaller than the sum of its proper divisors (114022851714).

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

66745083816 is a wasteful number, since it uses less digits than its factorization.

66745083816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 927015065 (or 927015058 counting only the distinct ones).

The product of its (nonzero) digits is 5806080, while the sum is 54.

The spelling of 66745083816 in words is "sixty-six billion, seven hundred forty-five million, eighty-three thousand, eight hundred sixteen".