66707055771 has 4 divisors (see below), whose sum is σ = 88942741032. Its totient is φ = 44471370512.

The previous prime is 66707055721. The next prime is 66707055781. The reversal of 66707055771 is 17755070766.

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 66707055771 - 2¹⁰ = 66707054747 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66707055721) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 11117842626 + ... + 11117842631.

It is an arithmetic number, because the mean of its divisors is an integer number (22235685258).

Almost surely, 2^66707055771 is an apocalyptic number.

66707055771 is a deficient number, since it is larger than the sum of its proper divisors (22235685261).

66707055771 is a wasteful number, since it uses less digits than its factorization.

66707055771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22235685260.

The product of its (nonzero) digits is 2160900, while the sum is 51.

The spelling of 66707055771 in words is "sixty-six billion, seven hundred seven million, fifty-five thousand, seven hundred seventy-one".