256621526602471 has 2 divisors, whose sum is σ = 256621526602472. Its totient is φ = 256621526602470.

The previous prime is 256621526602453. The next prime is 256621526602559. The reversal of 256621526602471 is 174206625126652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256621526602471 - 2¹¹ = 256621526600423 is a prime.

It is a super-3 number, since 3×256621526602471³ (a number of 44 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256621526602451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128310763301235 + 128310763301236.

It is an arithmetic number, because the mean of its divisors is an integer number (128310763301236).

Almost surely, 2^{256621526602471} is an apocalyptic number.

256621526602471 is a deficient number, since it is larger than the sum of its proper divisors (1).

256621526602471 is an equidigital number, since it uses as much as digits as its factorization.

256621526602471 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14515200, while the sum is 55.

The spelling of 256621526602471 in words is "two hundred fifty-six trillion, six hundred twenty-one billion, five hundred twenty-six million, six hundred two thousand, four hundred seventy-one".