16256138417 has 2 divisors, whose sum is σ = 16256138418. Its totient is φ = 16256138416.

The previous prime is 16256138399. The next prime is 16256138419. The reversal of 16256138417 is 71483165261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15997443361 + 258695056 = 126481^2 + 16084^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16256138417 is a prime.

Together with 16256138419, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16256138419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8128069208 + 8128069209.

It is an arithmetic number, because the mean of its divisors is an integer number (8128069209).

Almost surely, 2^16256138417 is an apocalyptic number.

It is an amenable number.

16256138417 is a deficient number, since it is larger than the sum of its proper divisors (1).

16256138417 is an equidigital number, since it uses as much as digits as its factorization.

16256138417 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 241920, while the sum is 44.

The spelling of 16256138417 in words is "sixteen billion, two hundred fifty-six million, one hundred thirty-eight thousand, four hundred seventeen".