11551999806 has 48 divisors (see below), whose sum is σ = 25551296160. Its totient is φ = 3770919360.

The previous prime is 11551999801. The next prime is 11551999841. The reversal of 11551999806 is 60899915511.

11551999806 is a `hidden beast` number, since 1 + 1 + 551 + 9 + 9 + 9 + 80 + 6 = 666.

11551999806 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 not an unprimeable number, because it can be changed into a prime (11551999801) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 228471 + ... + 274413.

It is an arithmetic number, because the mean of its divisors is an integer number (532318670).

Almost surely, 2^11551999806 is an apocalyptic number.

11551999806 is an abundant number, since it is smaller than the sum of its proper divisors (13999296354).

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

11551999806 is a wasteful number, since it uses less digits than its factorization.

11551999806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46241 (or 46238 counting only the distinct ones).

The product of its (nonzero) digits is 874800, while the sum is 54.

The spelling of 11551999806 in words is "eleven billion, five hundred fifty-one million, nine hundred ninety-nine thousand, eight hundred six".