256928047117 has 24 divisors (see below), whose sum is σ = 304434309600. Its totient is φ = 216140180256.

The previous prime is 256928047093. The next prime is 256928047141. The reversal of 256928047117 is 711740829652.

It is an interprime number because it is at equal distance from previous prime (256928047093) and next prime (256928047141).

It is not a de Polignac number, because 256928047117 - 2¹⁹ = 256927522829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256928047517) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1717743 + ... + 1861315.

It is an arithmetic number, because the mean of its divisors is an integer number (12684762900).

Almost surely, 2^256928047117 is an apocalyptic number.

It is an amenable number.

256928047117 is a deficient number, since it is larger than the sum of its proper divisors (47506262483).

256928047117 is a wasteful number, since it uses less digits than its factorization.

256928047117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144265 (or 144258 counting only the distinct ones).

The product of its (nonzero) digits is 1693440, while the sum is 52.

The spelling of 256928047117 in words is "two hundred fifty-six billion, nine hundred twenty-eight million, forty-seven thousand, one hundred seventeen".