66308713 has 4 divisors (see below), whose sum is σ = 66395268. Its totient is φ = 66222160.

The previous prime is 66308707. The next prime is 66308719. The reversal of 66308713 is 31780366.

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

It is an interprime number because it is at equal distance from previous prime (66308707) and next prime (66308719).

It can be written as a sum of positive squares in 2 ways, for example, as 32296489 + 34012224 = 5683^2 + 5832^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66308713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66308719) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42118 + ... + 43663.

It is an arithmetic number, because the mean of its divisors is an integer number (16598817).

Almost surely, 2^66308713 is an apocalyptic number.

It is an amenable number.

66308713 is a deficient number, since it is larger than the sum of its proper divisors (86555).

66308713 is an equidigital number, since it uses as much as digits as its factorization.

66308713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86554.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 66308713 is about 8143.0162102258. The cubic root of 66308713 is about 404.7531147853.

The spelling of 66308713 in words is "sixty-six million, three hundred eight thousand, seven hundred thirteen".