256745384389 has 16 divisors (see below), whose sum is σ = 278182396800. Its totient is φ = 235551983040.

The previous prime is 256745384387. The next prime is 256745384419. The reversal of 256745384389 is 983483547652.

It is a cyclic number.

It is not a de Polignac number, because 256745384389 - 2¹ = 256745384387 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 256745384389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256745384383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2381634 + ... + 2487100.

It is an arithmetic number, because the mean of its divisors is an integer number (17386399800).

Almost surely, 2^256745384389 is an apocalyptic number.

It is an amenable number.

256745384389 is a deficient number, since it is larger than the sum of its proper divisors (21437012411).

256745384389 is a wasteful number, since it uses less digits than its factorization.

256745384389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106620.

The product of its digits is 174182400, while the sum is 64.

The spelling of 256745384389 in words is "two hundred fifty-six billion, seven hundred forty-five million, three hundred eighty-four thousand, three hundred eighty-nine".