256600507520 has 64 divisors (see below), whose sum is σ = 701069256000. Its totient is φ = 87977315328.

The previous prime is 256600507349. The next prime is 256600507523. The reversal of 256600507520 is 25705006652.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (256600507523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28633970 + ... + 28642929.

It is an arithmetic number, because the mean of its divisors is an integer number (10954207125).

Almost surely, 2^256600507520 is an apocalyptic number.

256600507520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256600507520 is an abundant number, since it is smaller than the sum of its proper divisors (444468748480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256600507520 is an equidigital number, since it uses as much as digits as its factorization.

256600507520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57276925 (or 57276913 counting only the distinct ones).

The product of its (nonzero) digits is 126000, while the sum is 38.

The spelling of 256600507520 in words is "two hundred fifty-six billion, six hundred million, five hundred seven thousand, five hundred twenty".