66794724549664 has 24 divisors (see below), whose sum is σ = 131787368029548. Its totient is φ = 33324916796160.

The previous prime is 66794724549647. The next prime is 66794724549671. The reversal of 66794724549664 is 46694542749766.

It can be written as a sum of positive squares in 2 ways, for example, as 64611694659600 + 2183029890064 = 8038140^2 + 1477508^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2263906227 + ... + 2263935730.

Almost surely, 2^{66794724549664} is an apocalyptic number.

It is an amenable number.

66794724549664 is a deficient number, since it is larger than the sum of its proper divisors (64992643479884).

66794724549664 is a wasteful number, since it uses less digits than its factorization.

66794724549664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4527842428 (or 4527842420 counting only the distinct ones).

The product of its digits is 13168189440, while the sum is 79.

The spelling of 66794724549664 in words is "sixty-six trillion, seven hundred ninety-four billion, seven hundred twenty-four million, five hundred forty-nine thousand, six hundred sixty-four".