256834447789 has 8 divisors (see below), whose sum is σ = 260779687200. Its totient is φ = 252892499376.

The previous prime is 256834447787. The next prime is 256834447799. The reversal of 256834447789 is 987744438652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 256834447789 - 2¹ = 256834447787 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (67).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256834447787) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 665239 + ... + 977860.

It is an arithmetic number, because the mean of its divisors is an integer number (32597460900).

Almost surely, 2^256834447789 is an apocalyptic number.

It is an amenable number.

256834447789 is a deficient number, since it is larger than the sum of its proper divisors (3945239411).

256834447789 is a wasteful number, since it uses less digits than its factorization.

256834447789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1645499.

The product of its digits is 325140480, while the sum is 67.

The spelling of 256834447789 in words is "two hundred fifty-six billion, eight hundred thirty-four million, four hundred forty-seven thousand, seven hundred eighty-nine".