256516021241341 has 2 divisors, whose sum is σ = 256516021241342. Its totient is φ = 256516021241340.

The previous prime is 256516021241323. The next prime is 256516021241393. The reversal of 256516021241341 is 143142120615652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 210498168188025 + 46017853053316 = 14508555^2 + 6783646^2 .

It is a cyclic number.

It is not a de Polignac number, because 256516021241341 - 2⁴¹ = 254316997985789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256516021241041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128258010620670 + 128258010620671.

It is an arithmetic number, because the mean of its divisors is an integer number (128258010620671).

Almost surely, 2^{256516021241341} is an apocalyptic number.

It is an amenable number.

256516021241341 is a deficient number, since it is larger than the sum of its proper divisors (1).

256516021241341 is an equidigital number, since it uses as much as digits as its factorization.

256516021241341 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 345600, while the sum is 43.

Adding to 256516021241341 its reverse (143142120615652), we get a palindrome (399658141856993).

The spelling of 256516021241341 in words is "two hundred fifty-six trillion, five hundred sixteen billion, twenty-one million, two hundred forty-one thousand, three hundred forty-one".