16253561509 has 2 divisors, whose sum is σ = 16253561510. Its totient is φ = 16253561508.

The previous prime is 16253561437. The next prime is 16253561551. The reversal of 16253561509 is 90516535261.

16253561509 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., 16090922500 + 162639009 = 126850^2 + 12753^2 .

It is a cyclic number.

It is not a de Polignac number, because 16253561509 - 2¹³ = 16253553317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16253567509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8126780754 + 8126780755.

It is an arithmetic number, because the mean of its divisors is an integer number (8126780755).

Almost surely, 2^16253561509 is an apocalyptic number.

It is an amenable number.

16253561509 is a deficient number, since it is larger than the sum of its proper divisors (1).

16253561509 is an equidigital number, since it uses as much as digits as its factorization.

16253561509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 243000, while the sum is 43.

The spelling of 16253561509 in words is "sixteen billion, two hundred fifty-three million, five hundred sixty-one thousand, five hundred nine".