256601543 has 8 divisors (see below), whose sum is σ = 280091280. Its totient is φ = 233138880.

The previous prime is 256601537. The next prime is 256601551. The reversal of 256601543 is 345106652.

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

It is a cyclic number.

It is not a de Polignac number, because 256601543 - 2⁸ = 256601287 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 (256601503) 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, 16571 + ... + 28067.

It is an arithmetic number, because the mean of its divisors is an integer number (35011410).

Almost surely, 2^256601543 is an apocalyptic number.

256601543 is a deficient number, since it is larger than the sum of its proper divisors (23489737).

256601543 is a wasteful number, since it uses less digits than its factorization.

256601543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13537.

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 256601543 is about 16018.7871887980. The cubic root of 256601543 is about 635.4573702870.

The spelling of 256601543 in words is "two hundred fifty-six million, six hundred one thousand, five hundred forty-three".