256556509803011 has 8 divisors (see below), whose sum is σ = 279890530823664. Its totient is φ = 233224272440320.

The previous prime is 256556509803007. The next prime is 256556509803049. The reversal of 256556509803011 is 110308905655652.

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 256556509803011 - 2² = 256556509803007 is a prime.

It is a super-2 number, since 2×256556509803011² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256556509803311) 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 7 ways as a sum of consecutive naturals, for example, 445613726 + ... + 446189091.

It is an arithmetic number, because the mean of its divisors is an integer number (34986316352958).

Almost surely, 2^{256556509803011} is an apocalyptic number.

256556509803011 is a deficient number, since it is larger than the sum of its proper divisors (23334021020653).

256556509803011 is a wasteful number, since it uses less digits than its factorization.

256556509803011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 891828981.

The product of its (nonzero) digits is 9720000, while the sum is 56.

The spelling of 256556509803011 in words is "two hundred fifty-six trillion, five hundred fifty-six billion, five hundred nine million, eight hundred three thousand, eleven".