261138864216 has 16 divisors (see below), whose sum is σ = 652847160600. Its totient is φ = 87046288064.

The previous prime is 261138864187. The next prime is 261138864229. The reversal of 261138864216 is 612468831162.

261138864216 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5440392981 + ... + 5440393028.

Almost surely, 2^261138864216 is an apocalyptic number.

It is an amenable number.

261138864216 is an abundant number, since it is smaller than the sum of its proper divisors (391708296384).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261138864216 is a wasteful number, since it uses less digits than its factorization.

261138864216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10880786018 (or 10880786014 counting only the distinct ones).

The product of its digits is 663552, while the sum is 48.

The spelling of 261138864216 in words is "two hundred sixty-one billion, one hundred thirty-eight million, eight hundred sixty-four thousand, two hundred sixteen".