66788655688767 has 8 divisors (see below), whose sum is σ = 89075357873920. Its totient is φ = 44513861981400.

The previous prime is 66788655688753. The next prime is 66788655688817. The reversal of 66788655688767 is 76788655688766.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66788655688767 - 2⁸ = 66788655688511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66788655688567) 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, 2977106359 + ... + 2977128792.

It is an arithmetic number, because the mean of its divisors is an integer number (11134419734240).

Almost surely, 2^{66788655688767} is an apocalyptic number.

66788655688767 is a deficient number, since it is larger than the sum of its proper divisors (22286702185153).

66788655688767 is a wasteful number, since it uses less digits than its factorization.

66788655688767 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5954238893.

The product of its digits is 273118003200, while the sum is 93.

Subtracting 66788655688767 from its reverse (76788655688766), we obtain a palindrome (9999999999999).

The spelling of 66788655688767 in words is "sixty-six trillion, seven hundred eighty-eight billion, six hundred fifty-five million, six hundred eighty-eight thousand, seven hundred sixty-seven".