66528713 has 2 divisors, whose sum is σ = 66528714. Its totient is φ = 66528712.

The previous prime is 66528703. The next prime is 66528731. The reversal of 66528713 is 31782566.

Together with next prime (66528731) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60016009 + 6512704 = 7747^2 + 2552^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66528713 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (66528703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33264356 + 33264357.

It is an arithmetic number, because the mean of its divisors is an integer number (33264357).

Almost surely, 2^66528713 is an apocalyptic number.

It is an amenable number.

66528713 is a deficient number, since it is larger than the sum of its proper divisors (1).

66528713 is an equidigital number, since it uses as much as digits as its factorization.

66528713 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 38.

The square root of 66528713 is about 8156.5135321410. The cubic root of 66528713 is about 405.2002525411.

The spelling of 66528713 in words is "sixty-six million, five hundred twenty-eight thousand, seven hundred thirteen".