11812881638 has 8 divisors (see below), whose sum is σ = 18290913600. Its totient is φ = 5715910440.

The previous prime is 11812881601. The next prime is 11812881643. The reversal of 11812881638 is 83618821811.

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 = 11812881592 and 11812881601.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95265113 + ... + 95265236.

It is an arithmetic number, because the mean of its divisors is an integer number (2286364200).

Almost surely, 2^11812881638 is an apocalyptic number.

11812881638 is a deficient number, since it is larger than the sum of its proper divisors (6478031962).

11812881638 is a wasteful number, since it uses less digits than its factorization.

11812881638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190530382.

The product of its digits is 147456, while the sum is 47.

The spelling of 11812881638 in words is "eleven billion, eight hundred twelve million, eight hundred eighty-one thousand, six hundred thirty-eight".