16545720216449 has 2 divisors, whose sum is σ = 16545720216450. Its totient is φ = 16545720216448.

The previous prime is 16545720216439. The next prime is 16545720216457. The reversal of 16545720216449 is 94461202754561.

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., 16319660857600 + 226059358849 = 4039760^2 + 475457^2 .

It is a cyclic number.

It is not a de Polignac number, because 16545720216449 - 2¹⁶ = 16545720150913 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16545720216394 and 16545720216403.

It is not a weakly prime, because it can be changed into another prime (16545720216439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8272860108224 + 8272860108225.

It is an arithmetic number, because the mean of its divisors is an integer number (8272860108225).

Almost surely, 2^{16545720216449} is an apocalyptic number.

It is an amenable number.

16545720216449 is a deficient number, since it is larger than the sum of its proper divisors (1).

16545720216449 is an equidigital number, since it uses as much as digits as its factorization.

16545720216449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14515200, while the sum is 56.

The spelling of 16545720216449 in words is "sixteen trillion, five hundred forty-five billion, seven hundred twenty million, two hundred sixteen thousand, four hundred forty-nine".