66994656536 has 16 divisors (see below), whose sum is σ = 126367169040. Its totient is φ = 33296744800.

The previous prime is 66994656529. The next prime is 66994656563. The reversal of 66994656536 is 63565649966.

It is a congruent number.

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, 25071515 + ... + 25074186.

It is an arithmetic number, because the mean of its divisors is an integer number (7897948065).

Almost surely, 2^66994656536 is an apocalyptic number.

It is an amenable number.

66994656536 is a deficient number, since it is larger than the sum of its proper divisors (59372512504).

66994656536 is a wasteful number, since it uses less digits than its factorization.

66994656536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50145874 (or 50145870 counting only the distinct ones).

The product of its digits is 188956800, while the sum is 65.

The spelling of 66994656536 in words is "sixty-six billion, nine hundred ninety-four million, six hundred fifty-six thousand, five hundred thirty-six".