263226547645381 has 2 divisors, whose sum is σ = 263226547645382. Its totient is φ = 263226547645380.

The previous prime is 263226547645367. The next prime is 263226547645403. The reversal of 263226547645381 is 183546745622362.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 230469137064100 + 32757410581281 = 15181210^2 + 5723409^2 .

It is a cyclic number.

It is not a de Polignac number, because 263226547645381 - 2⁷ = 263226547645253 is a prime.

It is a super-2 number, since 2×263226547645381² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (263226547645351) 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, 131613273822690 + 131613273822691.

It is an arithmetic number, because the mean of its divisors is an integer number (131613273822691).

Almost surely, 2^{263226547645381} is an apocalyptic number.

It is an amenable number.

263226547645381 is a deficient number, since it is larger than the sum of its proper divisors (1).

263226547645381 is an equidigital number, since it uses as much as digits as its factorization.

263226547645381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 348364800, while the sum is 64.

The spelling of 263226547645381 in words is "two hundred sixty-three trillion, two hundred twenty-six billion, five hundred forty-seven million, six hundred forty-five thousand, three hundred eighty-one".