66766801 has 8 divisors (see below), whose sum is σ = 67368960. Its totient is φ = 66167808.

The previous prime is 66766783. The next prime is 66766807. The reversal of 66766801 is 10866766.

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 66766801 - 2⁷ = 66766673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66766807) 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, 60880 + ... + 61966.

It is an arithmetic number, because the mean of its divisors is an integer number (8421120).

Almost surely, 2^66766801 is an apocalyptic number.

It is an amenable number.

66766801 is a deficient number, since it is larger than the sum of its proper divisors (602159).

66766801 is a wasteful number, since it uses less digits than its factorization.

66766801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1583.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 66766801 is about 8171.0954589945. The cubic root of 66766801 is about 405.6830438944.

The spelling of 66766801 in words is "sixty-six million, seven hundred sixty-six thousand, eight hundred one".