256553543 has 4 divisors (see below), whose sum is σ = 258187800. Its totient is φ = 254919288.

The previous prime is 256553501. The next prime is 256553567. The reversal of 256553543 is 345355652.

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 256553543 - 2⁸ = 256553287 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 256553497 and 256553506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256553593) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 816893 + ... + 817206.

It is an arithmetic number, because the mean of its divisors is an integer number (64546950).

Almost surely, 2^256553543 is an apocalyptic number.

256553543 is a deficient number, since it is larger than the sum of its proper divisors (1634257).

256553543 is a wasteful number, since it uses less digits than its factorization.

256553543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1634256.

The product of its digits is 270000, while the sum is 38.

The square root of 256553543 is about 16017.2888779593. The cubic root of 256553543 is about 635.4177448357.

The spelling of 256553543 in words is "two hundred fifty-six million, five hundred fifty-three thousand, five hundred forty-three".