16330568265721 has 2 divisors, whose sum is σ = 16330568265722. Its totient is φ = 16330568265720.

The previous prime is 16330568265719. The next prime is 16330568265833. The reversal of 16330568265721 is 12756286503361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14514111248121 + 1816457017600 = 3809739^2 + 1347760^2 .

It is an emirp because it is prime and its reverse (12756286503361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16330568265721 - 2¹ = 16330568265719 is a prime.

Together with 16330568265719, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (16330568235721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8165284132860 + 8165284132861.

It is an arithmetic number, because the mean of its divisors is an integer number (8165284132861).

Almost surely, 2^{16330568265721} is an apocalyptic number.

It is an amenable number.

16330568265721 is a deficient number, since it is larger than the sum of its proper divisors (1).

16330568265721 is an equidigital number, since it uses as much as digits as its factorization.

16330568265721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10886400, while the sum is 55.

The spelling of 16330568265721 in words is "sixteen trillion, three hundred thirty billion, five hundred sixty-eight million, two hundred sixty-five thousand, seven hundred twenty-one".