66327072108221 has 2 divisors, whose sum is σ = 66327072108222. Its totient is φ = 66327072108220.

The previous prime is 66327072108169. The next prime is 66327072108281. The reversal of 66327072108221 is 12280127072366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58824896328121 + 7502175780100 = 7669739^2 + 2739010^2 .

It is a cyclic number.

It is not a de Polignac number, because 66327072108221 - 2¹⁴ = 66327072091837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66327072108281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33163536054110 + 33163536054111.

It is an arithmetic number, because the mean of its divisors is an integer number (33163536054111).

Almost surely, 2^{66327072108221} is an apocalyptic number.

It is an amenable number.

66327072108221 is a deficient number, since it is larger than the sum of its proper divisors (1).

66327072108221 is an equidigital number, since it uses as much as digits as its factorization.

66327072108221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 677376, while the sum is 47.

The spelling of 66327072108221 in words is "sixty-six trillion, three hundred twenty-seven billion, seventy-two million, one hundred eight thousand, two hundred twenty-one".