321056666129 has 2 divisors, whose sum is σ = 321056666130. Its totient is φ = 321056666128.

The previous prime is 321056666123. The next prime is 321056666213. The reversal of 321056666129 is 921666650123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 239904040000 + 81152626129 = 489800^2 + 284873^2 .

It is an emirp because it is prime and its reverse (921666650123) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321056666129 is a prime.

It is not a weakly prime, because it can be changed into another prime (321056666123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160528333064 + 160528333065.

It is an arithmetic number, because the mean of its divisors is an integer number (160528333065).

Almost surely, 2^321056666129 is an apocalyptic number.

It is an amenable number.

321056666129 is a deficient number, since it is larger than the sum of its proper divisors (1).

321056666129 is an equidigital number, since it uses as much as digits as its factorization.

321056666129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 699840, while the sum is 47.

The spelling of 321056666129 in words is "three hundred twenty-one billion, fifty-six million, six hundred sixty-six thousand, one hundred twenty-nine".