16326866303261 has 2 divisors, whose sum is σ = 16326866303262. Its totient is φ = 16326866303260.

The previous prime is 16326866303239. The next prime is 16326866303347. The reversal of 16326866303261 is 16230366862361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8722536119236 + 7604330184025 = 2953394^2 + 2757595^2 .

It is an emirp because it is prime and its reverse (16230366862361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16326866303261 - 2¹⁰ = 16326866302237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16326866303161) 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, 8163433151630 + 8163433151631.

It is an arithmetic number, because the mean of its divisors is an integer number (8163433151631).

Almost surely, 2^{16326866303261} is an apocalyptic number.

It is an amenable number.

16326866303261 is a deficient number, since it is larger than the sum of its proper divisors (1).

16326866303261 is an equidigital number, since it uses as much as digits as its factorization.

16326866303261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6718464, while the sum is 53.

The spelling of 16326866303261 in words is "sixteen trillion, three hundred twenty-six billion, eight hundred sixty-six million, three hundred three thousand, two hundred sixty-one".