256641265016526 has 32 divisors (see below), whose sum is σ = 558238730319648. Its totient is φ = 78184696118400.

The previous prime is 256641265016407. The next prime is 256641265016569. The reversal of 256641265016526 is 625610562146652.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16288470481 + ... + 16288486236.

It is an arithmetic number, because the mean of its divisors is an integer number (17444960322489).

Almost surely, 2^{256641265016526} is an apocalyptic number.

256641265016526 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

256641265016526 is an abundant number, since it is smaller than the sum of its proper divisors (301597465303122).

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

256641265016526 is a wasteful number, since it uses less digits than its factorization.

256641265016526 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32576956836.

The product of its (nonzero) digits is 31104000, while the sum is 57.

The spelling of 256641265016526 in words is "two hundred fifty-six trillion, six hundred forty-one billion, two hundred sixty-five million, sixteen thousand, five hundred twenty-six".