261440050044 has 24 divisors (see below), whose sum is σ = 611249296000. Its totient is φ = 86972038704.

The previous prime is 261440050037. The next prime is 261440050057. The reversal of 261440050044 is 440050044162.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 261440049993 and 261440050020.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21824344 + ... + 21836319.

Almost surely, 2^261440050044 is an apocalyptic number.

It is an amenable number.

261440050044 is an abundant number, since it is smaller than the sum of its proper divisors (349809245956).

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

261440050044 is a wasteful number, since it uses less digits than its factorization.

261440050044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43661169 (or 43661167 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 30.

The spelling of 261440050044 in words is "two hundred sixty-one billion, four hundred forty million, fifty thousand, forty-four".