261544534241343 has 8 divisors (see below), whose sum is σ = 348736946537856. Its totient is φ = 174357572386200.

The previous prime is 261544534241323. The next prime is 261544534241357. The reversal of 261544534241343 is 343142435445162.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 261544534241343 - 2⁶ = 261544534241279 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261544534241323) 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 in 7 ways as a sum of consecutive naturals, for example, 1362498373 + ... + 1362690318.

It is an arithmetic number, because the mean of its divisors is an integer number (43592118317232).

Almost surely, 2^{261544534241343} is an apocalyptic number.

261544534241343 is a deficient number, since it is larger than the sum of its proper divisors (87192412296513).

261544534241343 is a wasteful number, since it uses less digits than its factorization.

261544534241343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2725220685.

The product of its digits is 16588800, while the sum is 51.

The spelling of 261544534241343 in words is "two hundred sixty-one trillion, five hundred forty-four billion, five hundred thirty-four million, two hundred forty-one thousand, three hundred forty-three".