11781261384 has 32 divisors (see below), whose sum is σ = 29502360000. Its totient is φ = 3920526272.

The previous prime is 11781261367. The next prime is 11781261491. The reversal of 11781261384 is 48316218711.

11781261384 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 395379 + ... + 424130.

It is an arithmetic number, because the mean of its divisors is an integer number (921948750).

Almost surely, 2^11781261384 is an apocalyptic number.

It is an amenable number.

11781261384 is an abundant number, since it is smaller than the sum of its proper divisors (17721098616).

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

11781261384 is a wasteful number, since it uses less digits than its factorization.

11781261384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 820117 (or 820113 counting only the distinct ones).

The product of its digits is 64512, while the sum is 42.

The spelling of 11781261384 in words is "eleven billion, seven hundred eighty-one million, two hundred sixty-one thousand, three hundred eighty-four".