66705829 has 4 divisors (see below), whose sum is σ = 69006060. Its totient is φ = 64405600.

The previous prime is 66705823. The next prime is 66705869. The reversal of 66705829 is 92850766.

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

It can be written as a sum of positive squares in 2 ways, for example, as 18472804 + 48233025 = 4298^2 + 6945^2 .

It is a cyclic number.

It is not a de Polignac number, because 66705829 - 2¹¹ = 66703781 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 (66705823) 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 3 ways as a sum of consecutive naturals, for example, 1150072 + ... + 1150129.

It is an arithmetic number, because the mean of its divisors is an integer number (17251515).

Almost surely, 2^66705829 is an apocalyptic number.

It is an amenable number.

66705829 is a deficient number, since it is larger than the sum of its proper divisors (2300231).

66705829 is a wasteful number, since it uses less digits than its factorization.

66705829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2300230.

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 66705829 is about 8167.3636505301. The cubic root of 66705829 is about 405.5595152369.

The spelling of 66705829 in words is "sixty-six million, seven hundred five thousand, eight hundred twenty-nine".