66764713 has 2 divisors, whose sum is σ = 66764714. Its totient is φ = 66764712.

The previous prime is 66764693. The next prime is 66764743. The reversal of 66764713 is 31746766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62047129 + 4717584 = 7877^2 + 2172^2 .

It is a cyclic number.

It is not a de Polignac number, because 66764713 - 2¹⁷ = 66633641 is a prime.

It is not a weakly prime, because it can be changed into another prime (66764743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33382356 + 33382357.

It is an arithmetic number, because the mean of its divisors is an integer number (33382357).

Almost surely, 2^66764713 is an apocalyptic number.

It is an amenable number.

66764713 is a deficient number, since it is larger than the sum of its proper divisors (1).

66764713 is an equidigital number, since it uses as much as digits as its factorization.

66764713 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 127008, while the sum is 40.

The square root of 66764713 is about 8170.9676905493. The cubic root of 66764713 is about 405.6788148713.

The spelling of 66764713 in words is "sixty-six million, seven hundred sixty-four thousand, seven hundred thirteen".