66766867 has 2 divisors, whose sum is σ = 66766868. Its totient is φ = 66766866.

The previous prime is 66766859. The next prime is 66766873. The reversal of 66766867 is 76866766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66766867 - 2³ = 66766859 is a prime.

It is not a weakly prime, because it can be changed into another prime (66766807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33383433 + 33383434.

It is an arithmetic number, because the mean of its divisors is an integer number (33383434).

Almost surely, 2^66766867 is an apocalyptic number.

66766867 is a deficient number, since it is larger than the sum of its proper divisors (1).

66766867 is an equidigital number, since it uses as much as digits as its factorization.

66766867 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3048192, while the sum is 52.

The square root of 66766867 is about 8171.0994976196. The cubic root of 66766867 is about 405.6831775690.

The spelling of 66766867 in words is "sixty-six million, seven hundred sixty-six thousand, eight hundred sixty-seven".