16513278621839 has 2 divisors, whose sum is σ = 16513278621840. Its totient is φ = 16513278621838.

The previous prime is 16513278621799. The next prime is 16513278621893. The reversal of 16513278621839 is 93812687231561.

Together with next prime (16513278621893) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16513278621839 - 2²⁸ = 16513010186383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16513278621139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8256639310919 + 8256639310920.

It is an arithmetic number, because the mean of its divisors is an integer number (8256639310920).

Almost surely, 2^{16513278621839} is an apocalyptic number.

16513278621839 is a deficient number, since it is larger than the sum of its proper divisors (1).

16513278621839 is an equidigital number, since it uses as much as digits as its factorization.

16513278621839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26127360, while the sum is 62.

The spelling of 16513278621839 in words is "sixteen trillion, five hundred thirteen billion, two hundred seventy-eight million, six hundred twenty-one thousand, eight hundred thirty-nine".