16545520231109 has 2 divisors, whose sum is σ = 16545520231110. Its totient is φ = 16545520231108.

The previous prime is 16545520231069. The next prime is 16545520231127. The reversal of 16545520231109 is 90113202554561.

16545520231109 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15709950562084 + 835569669025 = 3963578^2 + 914095^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16545520231109 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16545520231109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16545520231189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8272760115554 + 8272760115555.

It is an arithmetic number, because the mean of its divisors is an integer number (8272760115555).

Almost surely, 2^{16545520231109} is an apocalyptic number.

It is an amenable number.

16545520231109 is a deficient number, since it is larger than the sum of its proper divisors (1).

16545520231109 is an equidigital number, since it uses as much as digits as its factorization.

16545520231109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324000, while the sum is 44.

The spelling of 16545520231109 in words is "sixteen trillion, five hundred forty-five billion, five hundred twenty million, two hundred thirty-one thousand, one hundred nine".