66766807 has 2 divisors, whose sum is σ = 66766808. Its totient is φ = 66766806.

The previous prime is 66766783. The next prime is 66766853. The reversal of 66766807 is 70866766.

It is an a-pointer prime, because the next prime (66766853) can be obtained adding 66766807 to its sum of digits (46).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66766807 - 2¹¹ = 66764759 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66766867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33383403 + 33383404.

It is an arithmetic number, because the mean of its divisors is an integer number (33383404).

Almost surely, 2^66766807 is an apocalyptic number.

66766807 is a deficient number, since it is larger than the sum of its proper divisors (1).

66766807 is an equidigital number, since it uses as much as digits as its factorization.

66766807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 508032, while the sum is 46.

The square root of 66766807 is about 8171.0958261423. The cubic root of 66766807 is about 405.6830560466.

The spelling of 66766807 in words is "sixty-six million, seven hundred sixty-six thousand, eight hundred seven".