255443064517 has 2 divisors, whose sum is σ = 255443064518. Its totient is φ = 255443064516.

The previous prime is 255443064491. The next prime is 255443064581. The reversal of 255443064517 is 715460344552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 234056634436 + 21386430081 = 483794^2 + 146241^2 .

It is a cyclic number.

It is not a de Polignac number, because 255443064517 - 2⁷ = 255443064389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255443064017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127721532258 + 127721532259.

It is an arithmetic number, because the mean of its divisors is an integer number (127721532259).

Almost surely, 2^255443064517 is an apocalyptic number.

It is an amenable number.

255443064517 is a deficient number, since it is larger than the sum of its proper divisors (1).

255443064517 is an equidigital number, since it uses as much as digits as its factorization.

255443064517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016000, while the sum is 46.

The spelling of 255443064517 in words is "two hundred fifty-five billion, four hundred forty-three million, sixty-four thousand, five hundred seventeen".