11111111000 has 256 divisors, whose sum is σ = 29248801920. Its totient is φ = 3916800000.

The previous prime is 11111110979. The next prime is 11111111059. The reversal of 11111111000 is 11111111.

It is a Harshad number since it is a multiple of its sum of digits (8).

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 81102932 + ... + 81103068.

Almost surely, 2^11111111000 is an apocalyptic number.

11111111000 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 11111111000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14624400960).

11111111000 is an abundant number, since it is smaller than the sum of its proper divisors (18137690920).

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

11111111000 is a wasteful number, since it uses less digits than its factorization.

11111111000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343 (or 329 counting only the distinct ones).

The product of its (nonzero) digits is 1, while the sum is 8.

Adding to 11111111000 its reverse (11111111), we get a palindrome (11122222111).

11111111000 divided by its reverse (11111111) gives a cube (1000 = 10³).

It can be divided in two parts, 1111111 and 1000, that added together give a palindrome (1112111).

The spelling of 11111111000 in words is "eleven billion, one hundred eleven million, one hundred eleven thousand".