256500535556525 has 12 divisors (see below), whose sum is σ = 342526869020532. Its totient is φ = 189415780103040.

The previous prime is 256500535556509. The next prime is 256500535556549. The reversal of 256500535556525 is 525655535005652.

It can be written as a sum of positive squares in 6 ways, for example, as 33036216225796 + 223464319330729 = 5747714^2 + 14948723^2 .

It is not a de Polignac number, because 256500535556525 - 2⁴ = 256500535556509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 394616208224 + ... + 394616208873.

It is an arithmetic number, because the mean of its divisors is an integer number (28543905751711).

Almost surely, 2^{256500535556525} is an apocalyptic number.

256500535556525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

256500535556525 is a deficient number, since it is larger than the sum of its proper divisors (86026333464007).

256500535556525 is a wasteful number, since it uses less digits than its factorization.

256500535556525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 789232417120 (or 789232417115 counting only the distinct ones).

The product of its (nonzero) digits is 168750000, while the sum is 59.

The spelling of 256500535556525 in words is "two hundred fifty-six trillion, five hundred billion, five hundred thirty-five million, five hundred fifty-six thousand, five hundred twenty-five".