11811178642 has 8 divisors (see below), whose sum is σ = 17729135676. Its totient is φ = 5901466752.

The previous prime is 11811178637. The next prime is 11811178669. The reversal of 11811178642 is 24687111811.

11811178642 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 11577975201 + 233203441 = 107601^2 + 15271^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 11811178595 and 11811178604.

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, 2057703 + ... + 2063434.

Almost surely, 2^11811178642 is an apocalyptic number.

11811178642 is a deficient number, since it is larger than the sum of its proper divisors (5917957034).

11811178642 is a wasteful number, since it uses less digits than its factorization.

11811178642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4122572.

The product of its digits is 21504, while the sum is 40.

The spelling of 11811178642 in words is "eleven billion, eight hundred eleven million, one hundred seventy-eight thousand, six hundred forty-two".