261543741734471 has 16 divisors (see below), whose sum is σ = 301868325184320. Its totient is φ = 221959481452800.

The previous prime is 261543741734461. The next prime is 261543741734479. The reversal of 261543741734471 is 174437147345162.

It is not a de Polignac number, because 261543741734471 - 2¹⁴ = 261543741718087 is a prime.

It is a super-3 number, since 3×261543741734471³ (a number of 44 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261543741734471.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261543741734479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 136116995 + ... + 138025083.

It is an arithmetic number, because the mean of its divisors is an integer number (18866770324020).

Almost surely, 2^{261543741734471} is an apocalyptic number.

261543741734471 is a deficient number, since it is larger than the sum of its proper divisors (40324583449849).

261543741734471 is a wasteful number, since it uses less digits than its factorization.

261543741734471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2102074.

The product of its digits is 47416320, while the sum is 59.

The spelling of 261543741734471 in words is "two hundred sixty-one trillion, five hundred forty-three billion, seven hundred forty-one million, seven hundred thirty-four thousand, four hundred seventy-one".