66888754668929 has 2 divisors, whose sum is σ = 66888754668930. Its totient is φ = 66888754668928.

The previous prime is 66888754668913. The next prime is 66888754668943. The reversal of 66888754668929 is 92986645788866.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51733710538225 + 15155044130704 = 7192615^2 + 3892948^2 .

It is a cyclic number.

It is not a de Polignac number, because 66888754668929 - 2⁴ = 66888754668913 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (66888754668959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33444377334464 + 33444377334465.

It is an arithmetic number, because the mean of its divisors is an integer number (33444377334465).

Almost surely, 2^{66888754668929} is an apocalyptic number.

It is an amenable number.

66888754668929 is a deficient number, since it is larger than the sum of its proper divisors (1).

66888754668929 is an equidigital number, since it uses as much as digits as its factorization.

66888754668929 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120394874880, while the sum is 92.

The spelling of 66888754668929 in words is "sixty-six trillion, eight hundred eighty-eight billion, seven hundred fifty-four million, six hundred sixty-eight thousand, nine hundred twenty-nine".