681291011329 has 2 divisors, whose sum is σ = 681291011330. Its totient is φ = 681291011328.

The previous prime is 681291011309. The next prime is 681291011353. The reversal of 681291011329 is 923110192186.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 555583890625 + 125707120704 = 745375^2 + 354552^2 .

It is a cyclic number.

It is not a de Polignac number, because 681291011329 - 2¹¹ = 681291009281 is a prime.

It is not a weakly prime, because it can be changed into another prime (681291011309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340645505664 + 340645505665.

It is an arithmetic number, because the mean of its divisors is an integer number (340645505665).

Almost surely, 2^681291011329 is an apocalyptic number.

It is an amenable number.

681291011329 is a deficient number, since it is larger than the sum of its proper divisors (1).

681291011329 is an equidigital number, since it uses as much as digits as its factorization.

681291011329 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 43.

The spelling of 681291011329 in words is "six hundred eighty-one billion, two hundred ninety-one million, eleven thousand, three hundred twenty-nine".