16780146102721 has 2 divisors, whose sum is σ = 16780146102722. Its totient is φ = 16780146102720.

The previous prime is 16780146102649. The next prime is 16780146102737. The reversal of 16780146102721 is 12720164108761.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14276979123121 + 2503166979600 = 3778489^2 + 1582140^2 .

It is a cyclic number.

It is not a de Polignac number, because 16780146102721 - 2¹¹ = 16780146100673 is a prime.

It is not a weakly prime, because it can be changed into another prime (16780146102781) 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, 8390073051360 + 8390073051361.

It is an arithmetic number, because the mean of its divisors is an integer number (8390073051361).

Almost surely, 2^{16780146102721} is an apocalyptic number.

It is an amenable number.

16780146102721 is a deficient number, since it is larger than the sum of its proper divisors (1).

16780146102721 is an equidigital number, since it uses as much as digits as its factorization.

16780146102721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 225792, while the sum is 46.

The spelling of 16780146102721 in words is "sixteen trillion, seven hundred eighty billion, one hundred forty-six million, one hundred two thousand, seven hundred twenty-one".