16513806525109 has 2 divisors, whose sum is σ = 16513806525110. Its totient is φ = 16513806525108.

The previous prime is 16513806525071. The next prime is 16513806525133. The reversal of 16513806525109 is 90152560831561.

16513806525109 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., 15643171971025 + 870634554084 = 3955145^2 + 933078^2 .

It is a cyclic number.

It is not a de Polignac number, because 16513806525109 - 2¹¹ = 16513806523061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16513806525149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8256903262554 + 8256903262555.

It is an arithmetic number, because the mean of its divisors is an integer number (8256903262555).

Almost surely, 2^{16513806525109} is an apocalyptic number.

It is an amenable number.

16513806525109 is a deficient number, since it is larger than the sum of its proper divisors (1).

16513806525109 is an equidigital number, since it uses as much as digits as its factorization.

16513806525109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944000, while the sum is 52.

The spelling of 16513806525109 in words is "sixteen trillion, five hundred thirteen billion, eight hundred six million, five hundred twenty-five thousand, one hundred nine".