256814701447 has 4 divisors (see below), whose sum is σ = 256952258056. Its totient is φ = 256677144840.

The previous prime is 256814701433. The next prime is 256814701477. The reversal of 256814701447 is 744107418652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 256814701447 - 2¹¹ = 256814699399 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 256814701447.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256814701477) 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 3 ways as a sum of consecutive naturals, for example, 68775504 + ... + 68779237.

It is an arithmetic number, because the mean of its divisors is an integer number (64238064514).

Almost surely, 2^256814701447 is an apocalyptic number.

256814701447 is a deficient number, since it is larger than the sum of its proper divisors (137556609).

256814701447 is a wasteful number, since it uses less digits than its factorization.

256814701447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137556608.

The product of its (nonzero) digits is 1505280, while the sum is 49.

The spelling of 256814701447 in words is "two hundred fifty-six billion, eight hundred fourteen million, seven hundred one thousand, four hundred forty-seven".