261543700013411 has 4 divisors (see below), whose sum is σ = 265447337327112. Its totient is φ = 257640062699712.

The previous prime is 261543700013399. The next prime is 261543700013441. The reversal of 261543700013411 is 114310007345162.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 261543700013411 - 2¹⁸ = 261543699751267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261543700013441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1951818656750 + ... + 1951818656883.

It is an arithmetic number, because the mean of its divisors is an integer number (66361834331778).

Almost surely, 2^{261543700013411} is an apocalyptic number.

261543700013411 is a deficient number, since it is larger than the sum of its proper divisors (3903637313701).

261543700013411 is an equidigital number, since it uses as much as digits as its factorization.

261543700013411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3903637313700.

The product of its (nonzero) digits is 60480, while the sum is 38.

Adding to 261543700013411 its reverse (114310007345162), we get a palindrome (375853707358573).

The spelling of 261543700013411 in words is "two hundred sixty-one trillion, five hundred forty-three billion, seven hundred million, thirteen thousand, four hundred eleven".