66810711011 has 4 divisors (see below), whose sum is σ = 72884412024. Its totient is φ = 60737010000.

The previous prime is 66810710963. The next prime is 66810711073. The reversal of 66810711011 is 11011701866.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66810711011 - 2²⁶ = 66743602147 is a prime.

It is a super-3 number, since 3×66810711011³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66810710011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3036850490 + ... + 3036850511.

It is an arithmetic number, because the mean of its divisors is an integer number (18221103006).

Almost surely, 2^66810711011 is an apocalyptic number.

66810711011 is a deficient number, since it is larger than the sum of its proper divisors (6073701013).

66810711011 is a wasteful number, since it uses less digits than its factorization.

66810711011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6073701012.

The product of its (nonzero) digits is 2016, while the sum is 32.

The spelling of 66810711011 in words is "sixty-six billion, eight hundred ten million, seven hundred eleven thousand, eleven".