261543073533227 has 2 divisors, whose sum is σ = 261543073533228. Its totient is φ = 261543073533226.

The previous prime is 261543073533199. The next prime is 261543073533253. The reversal of 261543073533227 is 722335370345162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261543073533227 - 2⁸ = 261543073532971 is a prime.

It is not a weakly prime, because it can be changed into another prime (261543073530227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130771536766613 + 130771536766614.

It is an arithmetic number, because the mean of its divisors is an integer number (130771536766614).

Almost surely, 2^{261543073533227} is an apocalyptic number.

261543073533227 is a deficient number, since it is larger than the sum of its proper divisors (1).

261543073533227 is an equidigital number, since it uses as much as digits as its factorization.

261543073533227 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19051200, while the sum is 53.

The spelling of 261543073533227 in words is "two hundred sixty-one trillion, five hundred forty-three billion, seventy-three million, five hundred thirty-three thousand, two hundred twenty-seven".