16256138399 has 2 divisors, whose sum is σ = 16256138400. Its totient is φ = 16256138398.

The previous prime is 16256138363. The next prime is 16256138417. The reversal of 16256138399 is 99383165261.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16256138399 - 2¹⁶ = 16256072863 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16256138399.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16256138309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8128069199 + 8128069200.

It is an arithmetic number, because the mean of its divisors is an integer number (8128069200).

Almost surely, 2^16256138399 is an apocalyptic number.

16256138399 is a deficient number, since it is larger than the sum of its proper divisors (1).

16256138399 is an equidigital number, since it uses as much as digits as its factorization.

16256138399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2099520, while the sum is 53.

The spelling of 16256138399 in words is "sixteen billion, two hundred fifty-six million, one hundred thirty-eight thousand, three hundred ninety-nine".