11187138478 has 32 divisors (see below), whose sum is σ = 18163866240. Its totient is φ = 5149539360.

The previous prime is 11187138467. The next prime is 11187138511. The reversal of 11187138478 is 87483178111.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1236993 + ... + 1246003.

It is an arithmetic number, because the mean of its divisors is an integer number (567620820).

Almost surely, 2^11187138478 is an apocalyptic number.

11187138478 is a deficient number, since it is larger than the sum of its proper divisors (6976727762).

11187138478 is a wasteful number, since it uses less digits than its factorization.

11187138478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9952.

The product of its digits is 301056, while the sum is 49.

The spelling of 11187138478 in words is "eleven billion, one hundred eighty-seven million, one hundred thirty-eight thousand, four hundred seventy-eight".