11861856220 has 12 divisors (see below), whose sum is σ = 24909898104. Its totient is φ = 4744742480.

The previous prime is 11861856191. The next prime is 11861856257. The reversal of 11861856220 is 2265816811.

It is a happy number.

11861856220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 296546386 + ... + 296546425.

It is an arithmetic number, because the mean of its divisors is an integer number (2075824842).

Almost surely, 2^11861856220 is an apocalyptic number.

11861856220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11861856220 is an abundant number, since it is smaller than the sum of its proper divisors (13048041884).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11861856220 is a wasteful number, since it uses less digits than its factorization.

11861856220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 593092820 (or 593092818 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 40.

The spelling of 11861856220 in words is "eleven billion, eight hundred sixty-one million, eight hundred fifty-six thousand, two hundred twenty".