256521033531150 has 192 divisors, whose sum is σ = 656429814374400. Its totient is φ = 66258910725120.

The previous prime is 256521033531127. The next prime is 256521033531157. The reversal of 256521033531150 is 51135330125652.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256521033531157) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 662978946 + ... + 663365754.

It is an arithmetic number, because the mean of its divisors is an integer number (3418905283200).

Almost surely, 2^{256521033531150} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256521033531150, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (328214907187200).

256521033531150 is an abundant number, since it is smaller than the sum of its proper divisors (399908780843250).

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

256521033531150 is a wasteful number, since it uses less digits than its factorization.

256521033531150 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387843 (or 387838 counting only the distinct ones).

The product of its (nonzero) digits is 405000, while the sum is 42.

The spelling of 256521033531150 in words is "two hundred fifty-six trillion, five hundred twenty-one billion, thirty-three million, five hundred thirty-one thousand, one hundred fifty".