66755055765 has 16 divisors (see below), whose sum is σ = 106894884096. Its totient is φ = 35573764800.

The previous prime is 66755055761. The next prime is 66755055781. The reversal of 66755055765 is 56755055766.

It is a happy number.

66755055765 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 66755055765 - 2² = 66755055761 is a prime.

It is a Curzon number.

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 15 ways as a sum of consecutive naturals, for example, 1789146 + ... + 1826075.

It is an arithmetic number, because the mean of its divisors is an integer number (6680930256).

Almost surely, 2^66755055765 is an apocalyptic number.

It is an amenable number.

66755055765 is a deficient number, since it is larger than the sum of its proper divisors (40139828331).

66755055765 is a wasteful number, since it uses less digits than its factorization.

66755055765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3616460.

The product of its (nonzero) digits is 33075000, while the sum is 57.

Subtracting from 66755055765 its reverse (56755055766), we obtain a palindrome (9999999999).

The spelling of 66755055765 in words is "sixty-six billion, seven hundred fifty-five million, fifty-five thousand, seven hundred sixty-five".