66804679 has 4 divisors (see below), whose sum is σ = 70734384. Its totient is φ = 62874976.

The previous prime is 66804677. The next prime is 66804739. The reversal of 66804679 is 97640866.

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

It is not a de Polignac number, because 66804679 - 2¹ = 66804677 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 (66804677) 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, 1964827 + ... + 1964860.

It is an arithmetic number, because the mean of its divisors is an integer number (17683596).

Almost surely, 2^66804679 is an apocalyptic number.

66804679 is a deficient number, since it is larger than the sum of its proper divisors (3929705).

66804679 is a wasteful number, since it uses less digits than its factorization.

66804679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3929704.

The product of its (nonzero) digits is 435456, while the sum is 46.

The square root of 66804679 is about 8173.4129346314. The cubic root of 66804679 is about 405.7597464728.

The spelling of 66804679 in words is "sixty-six million, eight hundred four thousand, six hundred seventy-nine".