13255860945581 has 2 divisors, whose sum is σ = 13255860945582. Its totient is φ = 13255860945580.

The previous prime is 13255860945571. The next prime is 13255860945623. The reversal of 13255860945581 is 18554906855231.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10857881716900 + 2397979228681 = 3295130^2 + 1548541^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13255860945581 is a prime.

It is a super-2 number, since 2×13255860945581² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13255860945541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6627930472790 + 6627930472791.

It is an arithmetic number, because the mean of its divisors is an integer number (6627930472791).

Almost surely, 2^{13255860945581} is an apocalyptic number.

It is an amenable number.

13255860945581 is a deficient number, since it is larger than the sum of its proper divisors (1).

13255860945581 is an equidigital number, since it uses as much as digits as its factorization.

13255860945581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840000, while the sum is 62.

The spelling of 13255860945581 in words is "thirteen trillion, two hundred fifty-five billion, eight hundred sixty million, nine hundred forty-five thousand, five hundred eighty-one".