11978261138 has 8 divisors (see below), whose sum is σ = 17968170288. Its totient is φ = 5988871044.

The previous prime is 11978261129. The next prime is 11978261153. The reversal of 11978261138 is 83116287911.

11978261138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11978261092 and 11978261101.

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 3 ways as a sum of consecutive naturals, for example, 65756 + ... + 168167.

It is an arithmetic number, because the mean of its divisors is an integer number (2246021286).

Almost surely, 2^11978261138 is an apocalyptic number.

11978261138 is a deficient number, since it is larger than the sum of its proper divisors (5989909150).

11978261138 is a wasteful number, since it uses less digits than its factorization.

11978261138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259528.

The product of its digits is 145152, while the sum is 47.

The spelling of 11978261138 in words is "eleven billion, nine hundred seventy-eight million, two hundred sixty-one thousand, one hundred thirty-eight".