66749713 has 2 divisors, whose sum is σ = 66749714. Its totient is φ = 66749712.

The previous prime is 66749699. The next prime is 66749741. The reversal of 66749713 is 31794766.

66749713 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66716224 + 33489 = 8168^2 + 183^2 .

It is a cyclic number.

It is not a de Polignac number, because 66749713 - 2¹⁷ = 66618641 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66749713.

It is not a weakly prime, because it can be changed into another prime (66749743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33374856 + 33374857.

It is an arithmetic number, because the mean of its divisors is an integer number (33374857).

Almost surely, 2^66749713 is an apocalyptic number.

It is an amenable number.

66749713 is a deficient number, since it is larger than the sum of its proper divisors (1).

66749713 is an equidigital number, since it uses as much as digits as its factorization.

66749713 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 190512, while the sum is 43.

The square root of 66749713 is about 8170.0497550505. The cubic root of 66749713 is about 405.6484313662.

The spelling of 66749713 in words is "sixty-six million, seven hundred forty-nine thousand, seven hundred thirteen".