256530543 has 8 divisors (see below), whose sum is σ = 342131328. Its totient is φ = 170975064.

The previous prime is 256530529. The next prime is 256530581. The reversal of 256530543 is 345035652.

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

It is not a de Polignac number, because 256530543 - 2¹³ = 256522351 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256530943) 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, 5430 + ... + 23292.

It is an arithmetic number, because the mean of its divisors is an integer number (42766416).

Almost surely, 2^256530543 is an apocalyptic number.

256530543 is a deficient number, since it is larger than the sum of its proper divisors (85600785).

256530543 is a wasteful number, since it uses less digits than its factorization.

256530543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22653.

The product of its (nonzero) digits is 54000, while the sum is 33.

The square root of 256530543 is about 16016.5708876775. The cubic root of 256530543 is about 635.3987558887.

The spelling of 256530543 in words is "two hundred fifty-six million, five hundred thirty thousand, five hundred forty-three".