66689621328 has 40 divisors (see below), whose sum is σ = 187943479776. Its totient is φ = 20208976000.

The previous prime is 66689621281. The next prime is 66689621347. The reversal of 66689621328 is 82312698666.

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 7 ways as a sum of consecutive naturals, for example, 63152523 + ... + 63153578.

Almost surely, 2^66689621328 is an apocalyptic number.

It is an amenable number.

66689621328 is an abundant number, since it is smaller than the sum of its proper divisors (121253858448).

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

66689621328 is a wasteful number, since it uses less digits than its factorization.

66689621328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126306123 (or 126306117 counting only the distinct ones).

The product of its digits is 8957952, while the sum is 57.

The spelling of 66689621328 in words is "sixty-six billion, six hundred eighty-nine million, six hundred twenty-one thousand, three hundred twenty-eight".