66766799 has 4 divisors (see below), whose sum is σ = 72836520. Its totient is φ = 60697080.

The previous prime is 66766783. The next prime is 66766807. The reversal of 66766799 is 99766766.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66766799 - 2⁴ = 66766783 is a prime.

It is a Duffinian number.

It is a congruent number.

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 (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3034844 + ... + 3034865.

It is an arithmetic number, because the mean of its divisors is an integer number (18209130).

Almost surely, 2^66766799 is an apocalyptic number.

66766799 is a deficient number, since it is larger than the sum of its proper divisors (6069721).

66766799 is a wasteful number, since it uses less digits than its factorization.

66766799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6069720.

The product of its digits is 5143824, while the sum is 56.

The square root of 66766799 is about 8171.0953366119. The cubic root of 66766799 is about 405.6830398437.

It can be divided in two parts, 667667 and 99, that added together give a palindrome (667766).

The spelling of 66766799 in words is "sixty-six million, seven hundred sixty-six thousand, seven hundred ninety-nine".