16256321768387 has 2 divisors, whose sum is σ = 16256321768388. Its totient is φ = 16256321768386.

The previous prime is 16256321768377. The next prime is 16256321768399. The reversal of 16256321768387 is 78386712365261.

16256321768387 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (78386712365261) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16256321768387 - 2²⁰ = 16256320719811 is a prime.

It is not a weakly prime, because it can be changed into another prime (16256321768347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8128160884193 + 8128160884194.

It is an arithmetic number, because the mean of its divisors is an integer number (8128160884194).

Almost surely, 2^{16256321768387} is an apocalyptic number.

16256321768387 is a deficient number, since it is larger than the sum of its proper divisors (1).

16256321768387 is an equidigital number, since it uses as much as digits as its factorization.

16256321768387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 121927680, while the sum is 65.

The spelling of 16256321768387 in words is "sixteen trillion, two hundred fifty-six billion, three hundred twenty-one million, seven hundred sixty-eight thousand, three hundred eighty-seven".