16215465809 has 2 divisors, whose sum is σ = 16215465810. Its totient is φ = 16215465808.

The previous prime is 16215465787. The next prime is 16215465823. The reversal of 16215465809 is 90856451261.

16215465809 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., 14720483584 + 1494982225 = 121328^2 + 38665^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16215465809 is a prime.

It is not a weakly prime, because it can be changed into another prime (16215465209) 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, 8107732904 + 8107732905.

It is an arithmetic number, because the mean of its divisors is an integer number (8107732905).

Almost surely, 2^16215465809 is an apocalyptic number.

It is an amenable number.

16215465809 is a deficient number, since it is larger than the sum of its proper divisors (1).

16215465809 is an equidigital number, since it uses as much as digits as its factorization.

16215465809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 518400, while the sum is 47.

The spelling of 16215465809 in words is "sixteen billion, two hundred fifteen million, four hundred sixty-five thousand, eight hundred nine".