66666659913375 has 72 divisors (see below), whose sum is σ = 113356460219184. Its totient is φ = 34795171788000.

The previous prime is 66666659913341. The next prime is 66666659913401. The reversal of 66666659913375 is 57331995666666.

It is a happy number.

66666659913375 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 66666659913375 - 2⁶ = 66666659913311 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66666659913375.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 7431347640 + ... + 7431356610.

It is an arithmetic number, because the mean of its divisors is an integer number (1574395280822).

Almost surely, 2^{66666659913375} is an apocalyptic number.

66666659913375 is a deficient number, since it is larger than the sum of its proper divisors (46689800305809).

66666659913375 is an frugal number, since it uses more digits than its factorization.

66666659913375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18054 (or 9026 counting only the distinct ones).

The product of its digits is 5952139200, while the sum is 78.

The spelling of 66666659913375 in words is "sixty-six trillion, six hundred sixty-six billion, six hundred fifty-nine million, nine hundred thirteen thousand, three hundred seventy-five".