11861877638 has 8 divisors (see below), whose sum is σ = 19161494688. Its totient is φ = 5474712744.

The previous prime is 11861877637. The next prime is 11861877647. The reversal of 11861877638 is 83677816811.

11861877638 is digitally balanced in base 5, 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 congruent number.

It is not an unprimeable number, because it can be changed into a prime (11861877637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 228113006 + ... + 228113057.

It is an arithmetic number, because the mean of its divisors is an integer number (2395186836).

Almost surely, 2^11861877638 is an apocalyptic number.

11861877638 is a deficient number, since it is larger than the sum of its proper divisors (7299617050).

11861877638 is a wasteful number, since it uses less digits than its factorization.

11861877638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456226078.

The product of its digits is 2709504, while the sum is 56.

The spelling of 11861877638 in words is "eleven billion, eight hundred sixty-one million, eight hundred seventy-seven thousand, six hundred thirty-eight".