261533653446287 has 2 divisors, whose sum is σ = 261533653446288. Its totient is φ = 261533653446286.

The previous prime is 261533653446173. The next prime is 261533653446427. The reversal of 261533653446287 is 782644356335162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261533653446287 - 2¹⁰ = 261533653445263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261533643446287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130766826723143 + 130766826723144.

It is an arithmetic number, because the mean of its divisors is an integer number (130766826723144).

Almost surely, 2^{261533653446287} is an apocalyptic number.

261533653446287 is a deficient number, since it is larger than the sum of its proper divisors (1).

261533653446287 is an equidigital number, since it uses as much as digits as its factorization.

261533653446287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 522547200, while the sum is 65.

The spelling of 261533653446287 in words is "two hundred sixty-one trillion, five hundred thirty-three billion, six hundred fifty-three million, four hundred forty-six thousand, two hundred eighty-seven".