11551999805 has 16 divisors (see below), whose sum is σ = 14443329024. Its totient is φ = 8859887040.

The previous prime is 11551999801. The next prime is 11551999841. The reversal of 11551999805 is 50899915511.

11551999805 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11551999805 - 2² = 11551999801 is a prime.

It is a super-3 number, since 3×11551999805³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

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 15 ways as a sum of consecutive naturals, for example, 331682 + ... + 364851.

It is an arithmetic number, because the mean of its divisors is an integer number (902708064).

Almost surely, 2^11551999805 is an apocalyptic number.

It is an amenable number.

11551999805 is a deficient number, since it is larger than the sum of its proper divisors (2891329219).

11551999805 is a wasteful number, since it uses less digits than its factorization.

11551999805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 696676.

The product of its (nonzero) digits is 729000, while the sum is 53.

The spelling of 11551999805 in words is "eleven billion, five hundred fifty-one million, nine hundred ninety-nine thousand, eight hundred five".