66755055766 has 16 divisors (see below), whose sum is σ = 115166141856. Its totient is φ = 28427083776.

The previous prime is 66755055761. The next prime is 66755055781.

66755055766 is nontrivially palindromic in base 10.

66755055766 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 66755055766.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66755055761) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15183211 + ... + 15187606.

It is an arithmetic number, because the mean of its divisors is an integer number (7197883866).

Almost surely, 2^66755055766 is an apocalyptic number.

66755055766 is a deficient number, since it is larger than the sum of its proper divisors (48411086090).

66755055766 is a wasteful number, since it uses less digits than its factorization.

66755055766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30370983.

The product of its (nonzero) digits is 39690000, while the sum is 58.

The spelling of 66755055766 in words is "sixty-six billion, seven hundred fifty-five million, fifty-five thousand, seven hundred sixty-six".