16311878509 has 2 divisors, whose sum is σ = 16311878510. Its totient is φ = 16311878508.

The previous prime is 16311878467. The next prime is 16311878551. The reversal of 16311878509 is 90587811361.

It is a happy number.

16311878509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (16311878467) and next prime (16311878551).

It can be written as a sum of positive squares in only one way, i.e., 15746485225 + 565393284 = 125485^2 + 23778^2 .

It is an emirp because it is prime and its reverse (90587811361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16311878509 - 2⁷ = 16311878381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16311878579) 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, 8155939254 + 8155939255.

It is an arithmetic number, because the mean of its divisors is an integer number (8155939255).

Almost surely, 2^16311878509 is an apocalyptic number.

It is an amenable number.

16311878509 is a deficient number, since it is larger than the sum of its proper divisors (1).

16311878509 is an equidigital number, since it uses as much as digits as its factorization.

16311878509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 362880, while the sum is 49.

The spelling of 16311878509 in words is "sixteen billion, three hundred eleven million, eight hundred seventy-eight thousand, five hundred nine".