256506442206537 has 8 divisors (see below), whose sum is σ = 342008670461760. Its totient is φ = 171004254377840.

The previous prime is 256506442206529. The next prime is 256506442206541. The reversal of 256506442206537 is 735602244605652.

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 256506442206537 - 2³ = 256506442206529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256506442206587) 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, 10988539 + ... + 25174607.

It is an arithmetic number, because the mean of its divisors is an integer number (42751083807720).

Almost surely, 2^{256506442206537} is an apocalyptic number.

It is an amenable number.

256506442206537 is a deficient number, since it is larger than the sum of its proper divisors (85502228255223).

256506442206537 is a wasteful number, since it uses less digits than its factorization.

256506442206537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20213263.

The product of its (nonzero) digits is 72576000, while the sum is 57.

The spelling of 256506442206537 in words is "two hundred fifty-six trillion, five hundred six billion, four hundred forty-two million, two hundred six thousand, five hundred thirty-seven".