11638909878338 has 8 divisors (see below), whose sum is σ = 17458383194688. Its totient is φ = 5819448813444.

The previous prime is 11638909878329. The next prime is 11638909878353. The reversal of 11638909878338 is 83387890983611.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123806 + ... + 4826297.

It is an arithmetic number, because the mean of its divisors is an integer number (2182297899336).

Almost surely, 2^{11638909878338} is an apocalyptic number.

11638909878338 is a deficient number, since it is larger than the sum of its proper divisors (5819473316350).

11638909878338 is a wasteful number, since it uses less digits than its factorization.

11638909878338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6125728.

The product of its (nonzero) digits is 376233984, while the sum is 74.

The spelling of 11638909878338 in words is "eleven trillion, six hundred thirty-eight billion, nine hundred nine million, eight hundred seventy-eight thousand, three hundred thirty-eight".