11551111000 has 128 divisors (see below), whose sum is σ = 31755447360. Its totient is φ = 3877248000.

The previous prime is 11551110997. The next prime is 11551111001. The reversal of 11551111000 is 11115511.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11551111001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 102612 + ... + 183388.

Almost surely, 2^11551111000 is an apocalyptic number.

11551111000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11551111000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15877723680).

11551111000 is an abundant number, since it is smaller than the sum of its proper divisors (20204336360).

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

11551111000 is a wasteful number, since it uses less digits than its factorization.

11551111000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80822 (or 80808 counting only the distinct ones).

The product of its (nonzero) digits is 25, while the sum is 16.

Adding to 11551111000 its reverse (11115511), we get a palindrome (11562226511).

It can be divided in two parts, 115 and 51111000, that added together give a palindrome (51111115).

The spelling of 11551111000 in words is "eleven billion, five hundred fifty-one million, one hundred eleven thousand".