66327789286621 has 2 divisors, whose sum is σ = 66327789286622. Its totient is φ = 66327789286620.

The previous prime is 66327789286573. The next prime is 66327789286631. The reversal of 66327789286621 is 12668298772366.

66327789286621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65943153650521 + 384635636100 = 8120539^2 + 620190^2 .

It is a cyclic number.

It is not a de Polignac number, because 66327789286621 - 2¹⁷ = 66327789155549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66327789286631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33163894643310 + 33163894643311.

It is an arithmetic number, because the mean of its divisors is an integer number (33163894643311).

Almost surely, 2^{66327789286621} is an apocalyptic number.

It is an amenable number.

66327789286621 is a deficient number, since it is larger than the sum of its proper divisors (1).

66327789286621 is an equidigital number, since it uses as much as digits as its factorization.

66327789286621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 877879296, while the sum is 73.

The spelling of 66327789286621 in words is "sixty-six trillion, three hundred twenty-seven billion, seven hundred eighty-nine million, two hundred eighty-six thousand, six hundred twenty-one".