66660713 has 4 divisors (see below), whose sum is σ = 76183680. Its totient is φ = 57137748.

The previous prime is 66660701. The next prime is 66660731. The reversal of 66660713 is 31706666.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66660713 - 2⁸ = 66660457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66660773) 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, 4761473 + ... + 4761486.

It is an arithmetic number, because the mean of its divisors is an integer number (19045920).

Almost surely, 2^66660713 is an apocalyptic number.

It is an amenable number.

66660713 is a deficient number, since it is larger than the sum of its proper divisors (9522967).

66660713 is an equidigital number, since it uses as much as digits as its factorization.

66660713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9522966.

The product of its (nonzero) digits is 27216, while the sum is 35.

The square root of 66660713 is about 8164.6012150013. The cubic root of 66660713 is about 405.4680622111.

The spelling of 66660713 in words is "sixty-six million, six hundred sixty thousand, seven hundred thirteen".