256265042543 has 4 divisors (see below), whose sum is σ = 256422551880. Its totient is φ = 256107533208.

The previous prime is 256265042507. The next prime is 256265042563. The reversal of 256265042543 is 345240562652.

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 256265042543 - 2²⁴ = 256248265327 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 256265042494 and 256265042503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256265042563) 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, 78752228 + ... + 78755481.

It is an arithmetic number, because the mean of its divisors is an integer number (64105637970).

Almost surely, 2^256265042543 is an apocalyptic number.

256265042543 is a deficient number, since it is larger than the sum of its proper divisors (157509337).

256265042543 is a wasteful number, since it uses less digits than its factorization.

256265042543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157509336.

The product of its (nonzero) digits is 1728000, while the sum is 44.

The spelling of 256265042543 in words is "two hundred fifty-six billion, two hundred sixty-five million, forty-two thousand, five hundred forty-three".