16545720216551 has 2 divisors, whose sum is σ = 16545720216552. Its totient is φ = 16545720216550.

The previous prime is 16545720216457. The next prime is 16545720216563. The reversal of 16545720216551 is 15561202754561.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16545720216551 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16545720216551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16545723216551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8272860108275 + 8272860108276.

It is an arithmetic number, because the mean of its divisors is an integer number (8272860108276).

Almost surely, 2^{16545720216551} is an apocalyptic number.

16545720216551 is a deficient number, since it is larger than the sum of its proper divisors (1).

16545720216551 is an equidigital number, since it uses as much as digits as its factorization.

16545720216551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520000, while the sum is 50.

The spelling of 16545720216551 in words is "sixteen trillion, five hundred forty-five billion, seven hundred twenty million, two hundred sixteen thousand, five hundred fifty-one".