66681180529 has 2 divisors, whose sum is σ = 66681180530. Its totient is φ = 66681180528.

The previous prime is 66681180499. The next prime is 66681180541. The reversal of 66681180529 is 92508118666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42787749904 + 23893430625 = 206852^2 + 154575^2 .

It is a cyclic number.

It is not a de Polignac number, because 66681180529 - 2²¹ = 66679083377 is a prime.

It is not a weakly prime, because it can be changed into another prime (66681180329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33340590264 + 33340590265.

It is an arithmetic number, because the mean of its divisors is an integer number (33340590265).

Almost surely, 2^66681180529 is an apocalyptic number.

It is an amenable number.

66681180529 is a deficient number, since it is larger than the sum of its proper divisors (1).

66681180529 is an equidigital number, since it uses as much as digits as its factorization.

66681180529 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1244160, while the sum is 52.

The spelling of 66681180529 in words is "sixty-six billion, six hundred eighty-one million, one hundred eighty thousand, five hundred twenty-nine".