66728989089 has 24 divisors (see below), whose sum is σ = 111225276032. Its totient is φ = 37760644800.

The previous prime is 66728989069. The next prime is 66728989109. The reversal of 66728989089 is 98098982766.

66728989089 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (66728989069) and next prime (66728989109).

It is not a de Polignac number, because 66728989089 - 2⁵ = 66728989057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66728989069) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5135212 + ... + 5148189.

Almost surely, 2^66728989089 is an apocalyptic number.

It is an amenable number.

66728989089 is a deficient number, since it is larger than the sum of its proper divisors (44496286943).

66728989089 is a wasteful number, since it uses less digits than its factorization.

66728989089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10283517 (or 10283514 counting only the distinct ones).

The product of its (nonzero) digits is 188116992, while the sum is 72.

The spelling of 66728989089 in words is "sixty-six billion, seven hundred twenty-eight million, nine hundred eighty-nine thousand, eighty-nine".