256511734375 has 56 divisors (see below), whose sum is σ = 350050206800. Its totient is φ = 186818400000.

The previous prime is 256511734373. The next prime is 256511734397. The reversal of 256511734375 is 573437115652.

It is not a de Polignac number, because 256511734375 - 2¹ = 256511734373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256511734373) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 14819476 + ... + 14836774.

It is an arithmetic number, because the mean of its divisors is an integer number (6250896550).

Almost surely, 2^256511734375 is an apocalyptic number.

256511734375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

256511734375 is a deficient number, since it is larger than the sum of its proper divisors (93538472425).

256511734375 is an frugal number, since it uses more digits than its factorization.

256511734375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17415 (or 17390 counting only the distinct ones).

The product of its digits is 2646000, while the sum is 49.

The spelling of 256511734375 in words is "two hundred fifty-six billion, five hundred eleven million, seven hundred thirty-four thousand, three hundred seventy-five".