66647113 has 4 divisors (see below), whose sum is σ = 71773828. Its totient is φ = 61520400.

The previous prime is 66647083. The next prime is 66647137. The reversal of 66647113 is 31174666.

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 10517049 + 56130064 = 3243^2 + 7492^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66647113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66647143) 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, 2563338 + ... + 2563363.

It is an arithmetic number, because the mean of its divisors is an integer number (17943457).

Almost surely, 2^66647113 is an apocalyptic number.

It is an amenable number.

66647113 is a deficient number, since it is larger than the sum of its proper divisors (5126715).

66647113 is a wasteful number, since it uses less digits than its factorization.

66647113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5126714.

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

The square root of 66647113 is about 8163.7683088143. The cubic root of 66647113 is about 405.4404860449.

The spelling of 66647113 in words is "sixty-six million, six hundred forty-seven thousand, one hundred thirteen".