66886688888813 has 2 divisors, whose sum is σ = 66886688888814. Its totient is φ = 66886688888812.

The previous prime is 66886688888783. The next prime is 66886688888917. The reversal of 66886688888813 is 31888888668866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59798623963849 + 7088064924964 = 7732957^2 + 2662342^2 .

It is a cyclic number.

It is not a de Polignac number, because 66886688888813 - 2¹⁰ = 66886688887789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66886688288813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33443344444406 + 33443344444407.

It is an arithmetic number, because the mean of its divisors is an integer number (33443344444407).

Almost surely, 2^{66886688888813} is an apocalyptic number.

It is an amenable number.

66886688888813 is a deficient number, since it is larger than the sum of its proper divisors (1).

66886688888813 is an equidigital number, since it uses as much as digits as its factorization.

66886688888813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 65229815808, while the sum is 92.

The spelling of 66886688888813 in words is "sixty-six trillion, eight hundred eighty-six billion, six hundred eighty-eight million, eight hundred eighty-eight thousand, eight hundred thirteen".