66303709 has 4 divisors (see below), whose sum is σ = 66329116. Its totient is φ = 66278304.

The previous prime is 66303703. The next prime is 66303737. The reversal of 66303709 is 90730366.

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 29398084 + 36905625 = 5422^2 + 6075^2 .

It is a cyclic number.

It is not a de Polignac number, because 66303709 - 2³ = 66303701 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 (66303701) 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, 8274 + ... + 14179.

It is an arithmetic number, because the mean of its divisors is an integer number (16582279).

Almost surely, 2^66303709 is an apocalyptic number.

It is an amenable number.

66303709 is a deficient number, since it is larger than the sum of its proper divisors (25407).

66303709 is a wasteful number, since it uses less digits than its factorization.

66303709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25406.

The product of its (nonzero) digits is 20412, while the sum is 34.

The square root of 66303709 is about 8142.7089472730. The cubic root of 66303709 is about 404.7429329382.

The spelling of 66303709 in words is "sixty-six million, three hundred three thousand, seven hundred nine".