261544423371743 has 2 divisors, whose sum is σ = 261544423371744. Its totient is φ = 261544423371742.

The previous prime is 261544423371733. The next prime is 261544423371757. The reversal of 261544423371743 is 347173324445162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261544423371743 - 2²⁰ = 261544422323167 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261544423371733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130772211685871 + 130772211685872.

It is an arithmetic number, because the mean of its divisors is an integer number (130772211685872).

Almost surely, 2^{261544423371743} is an apocalyptic number.

261544423371743 is a deficient number, since it is larger than the sum of its proper divisors (1).

261544423371743 is an equidigital number, since it uses as much as digits as its factorization.

261544423371743 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40642560, while the sum is 56.

The spelling of 261544423371743 in words is "two hundred sixty-one trillion, five hundred forty-four billion, four hundred twenty-three million, three hundred seventy-one thousand, seven hundred forty-three".