66728470011 has 16 divisors (see below), whose sum is σ = 101737682688. Its totient is φ = 38109477600.

The previous prime is 66728470001. The next prime is 66728470049. The reversal of 66728470011 is 11007482766.

It is not a de Polignac number, because 66728470011 - 2¹⁹ = 66727945723 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66728470001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 839260 + ... + 915321.

It is an arithmetic number, because the mean of its divisors is an integer number (6358605168).

Almost surely, 2^66728470011 is an apocalyptic number.

66728470011 is a deficient number, since it is larger than the sum of its proper divisors (35009212677).

66728470011 is a wasteful number, since it uses less digits than its factorization.

66728470011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1756402.

The product of its (nonzero) digits is 112896, while the sum is 42.

The spelling of 66728470011 in words is "sixty-six billion, seven hundred twenty-eight million, four hundred seventy thousand, eleven".