66766705 has 8 divisors (see below), whose sum is σ = 80173800. Its totient is φ = 53377536.

The previous prime is 66766691. The next prime is 66766709. The reversal of 66766705 is 50766766.

It can be written as a sum of positive squares in 4 ways, for example, as 3659569 + 63107136 = 1913^2 + 7944^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 66766705 - 2⁵ = 66766673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66766709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5911 + ... + 12979.

It is an arithmetic number, because the mean of its divisors is an integer number (10021725).

Almost surely, 2^66766705 is an apocalyptic number.

It is an amenable number.

66766705 is a deficient number, since it is larger than the sum of its proper divisors (13407095).

66766705 is a wasteful number, since it uses less digits than its factorization.

66766705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8963.

The product of its (nonzero) digits is 317520, while the sum is 43.

The square root of 66766705 is about 8171.0895846270. The cubic root of 66766705 is about 405.6828494585.

The spelling of 66766705 in words is "sixty-six million, seven hundred sixty-six thousand, seven hundred five".