66707117177 has 4 divisors (see below), whose sum is σ = 67154816100. Its totient is φ = 66259418256.

The previous prime is 66707117123. The next prime is 66707117237. The reversal of 66707117177 is 77171170766.

It is a happy number.

66707117177 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 20741472361 + 45965644816 = 144019^2 + 214396^2 .

It is a cyclic number.

It is not a de Polignac number, because 66707117177 - 2²² = 66702922873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66707117777) 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, 223849238 + ... + 223849535.

It is an arithmetic number, because the mean of its divisors is an integer number (16788704025).

Almost surely, 2^66707117177 is an apocalyptic number.

It is an amenable number.

66707117177 is a deficient number, since it is larger than the sum of its proper divisors (447698923).

66707117177 is a wasteful number, since it uses less digits than its factorization.

66707117177 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447698922.

The product of its (nonzero) digits is 605052, while the sum is 50.

The spelling of 66707117177 in words is "sixty-six billion, seven hundred seven million, one hundred seventeen thousand, one hundred seventy-seven".